"The order of the instruments matters not, at least to those who don't pay enough attention. The Dizi at dawn, to welcome the sun and mimic the birds; the Pipa and Ruan at noon, to show the sun's splendor at its highest peak; the Guzheng at dusk, to thank the sun's performance as it heads to slumber; and the Ehru at midnight, coaxing the sun with the moonlight's song and gentle lullaby."

Yún, whose name is Liqin before the tragedy that set her into the path of a Watcher, is born on a chilly October evening to a pair of struggling merchants. Her much younger memories consisted of playing by the fields and out-running slimes in Qingce Village. Though the family of three may not have had the easiest time (especially in terms of mora), they seemed to be more or less content and happy. Most of Liqin's life as she grew older back then was spent doing nothing but helping out her parents to gain mora by performing in the Liyue Harbor or running errands for various shopkeepers whenever they visit Mondstadt for trade. Unfortunately, as mora seemed to be always tight, Liqin never really had many opportunities to play with children of her age as she was too pre-occupied with her jobs. This rather forced her to mature a bit, despite her young age.

When Liqin reached eleven years old, her parents wanted her to at least experience a small luxury other families could afford and splurge a bit. However, as they were about to celebrate, a business opportunity lands on their feet so, in apology, Liqin's parents brought her with them to work once again. As they were hurrying through Stone Gate, they passed by a similar caravan heading towards the opposite direction. The family paid it no mind up until the screaming and sudden shouting began. As the two caravans crossed, a pair of Lawachurls appeared, blocking the way. The monster destroys the caravan Liqin and her parents were on and nearly killed her as well. The other caravan seemed to be in a similar situation and finding no way out of the crisis, the parents of both caravans used themselves as distractions to get their kids to safety. It barely did nothing as the Lawachurls simply swiped them aside, half-killing them. Upon seeing their parents in that state, both children awaken their Vision and managed to fend off one of the Lawachurls. Before the two children could do anything further with their newly awakened Visions, they began to writh in pain, as they felt their Vision throb and destroy them from the inside.

As they were about to be killed by the remaining Lawachurl, a mysterious man had suddenly appeared and fought it back and defeated it with ease. Glancing at the two children, he went over to their dying parents, who called out to their children in pain before asking for the man's assistance. In exchange for their Oaths to a being called the Mad God, he promises to help them out as the worried parents finally let go and passed on. The man did the same thing, asking the two children for the cooperation and promise of Oath to the same being. Upon doing so, the throbbing finally stopped. The man, who named himself Yuè, had promised to train them and help them survive so that they could one day take back their freedom (and to continue his fight if he so ever fall to his demise)

Not really having anywhere to go now, Liqin agrees and along with the other child named Leon, follows the mysterious Yuè back to Liyue. After being adopted by him, Yuè gives the two their new names, Yún and Skye, mostly to distance themselves from the traumatic night (and to distinguish their new roles from their old life). Thus, starts their journey as Seeker apprentices of the former generation's strongest Watcher.

"Never get attached. The moment the Mad God deems them interesting, there must be no hesitation from either of you. A corpse has no place in the midst of our fight for our freedom."

As a mere Seeker, Yún holds no ability to use her Vision-Gaze, at least not with the same proficiency as Watchers. Despite that, Yuè trains her and Skye in Watcher skills (to the point of habit) that they would need later on. Moving while keeping their eyes perpetually shut (to avoid showing the Mad God, if it choses to look through them, anything interesting and forcing them to interfere), deflecting useless probing questions with simple words of politeness (as their Oaths would not allow them to divulge anything important anyway), even judgement of what to present to the Mad God as a temporary 'offering of entertainment' if they are in a pinch. Yuè drilled everything he had acquired from his years of experience onto the two. Yún and Skye take in everything without so much as a complain as they know what awaits them if they give up.

Yuè also did not neglect their combat training, acting as their master in the combat art of the polearm and claymore respectively. As he and Yún also share the same element, he taught her how to manipulate her Vision-Gaze as much as she could (though it would be years before she can actually show the fruits of her labor) without having to actually use it, which explains how she is so well-versed in her elemental mastery. As they got a bit older, he also added in training their bodies to handle Stacking and how to bear the burden and strain of their Gazes clawing at them at inopportune times.

During these years, Yún's reputation in Liyue Harbor also began rising as she continues making ends with what she is good at. She still helped around with chores and began helping out in the performance halls, giving her the chance to learn and observe the performers playing various instruments. Soon enough, she was recruited to be a performer, something she accepted gladly. After a while, she also began applying her combat skills to battle out certain monsters (most commonly, Hydro Slimes) as she performs and plays instruments on stage. Her training with Yuè had now blossomed as well, giving her some sort of polite and aloof attitude, earning her "Liyue's Mist Flower" nickname.

"For what it's worth, you, Skye, and Ame all deserve better. My only wish, is for you three to be the last generation to take over."

A few years before the Traveler arrives in Liyue, Yún ends up having a fateful encounter with the Fatui's Eleventh Harbinger, Tartaglia. Though originally, nothing much came out of them meeting (perhaps a few jokes and Tartaglia's interest in her performances) but an incident involving Yuè (with his reputation as Liyue's Elder Brother) that had her be in the center of the event ended up in Tartaglia's reports. As Yún was a rather big person of interest, he decided to keep his eye out for her by forcefully placing himself in her life (by reintroducing himself as 'Childe')

The incident digs deeper, however, as most of what had happened were not privy to the public eye (including the Fatui). As Skye in Mondstadt had already been promoted as a Watcher at this point, Yuè had also been preparing for Yún to take over his responsibilities, knowing that he might be targeted by the Mad God soon enough (especially after uncovering some big important secrets regarding the state of the Collective and actually being caught by the mad god) The little window of time he had gotten to prepare her mentally was also more than enough for it to force Skye to return to Liyue in order to take Yuè's life. Yún had tried to stop them but was unsuccessful at her attempt. They end up at the highest peak of Qingyun Peak, wherein Yuè tells Skye and Yún his final words, hoping that they wouldn't have to take in new Seeker apprentices as he had, before letting Skye slash at him as he falls to his death. After that, Yún was promoted as Liyue's Watcher, as she now continues Yuè's fight for their freedom. Though Skye may have been the one to 'kill' Yuè, she does concede that she bears no ill-will towards him, who she knew is just as torn up about it as she is.

Soon, Yún began implementing her Vision-Gaze (and practice her Stacking abilities) in her performances, causing Childe to be further intrigued by her. He never understood why she never used her Vision until now so he stays by her side, observing her. Yún doesn't mind it, though she is rather curious as to what a Fatui Harbinger would find out. As they are both drawn into the other's orbits, soon enough they slowly fall in love, their flirting becoming something genuine and the stakes grow bigger than just simply Yún promising her late elder-brother that she will fight for their freedom.

Upon the Traveler's arrival, this marks the start of the mad god's activity to increase as well, forcing the Watchers to finally fight head-on. Nothing is certain but one key fact is that Yún and the rest of the Watchers are at eye of the storm.