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Ki had been having visions of Cardia through the Echo and fell in love before ever meeting him. Cardia has given him a sense of purpose, belonging and love he had never known before.
Ki is the love of his life and Cardia's entire universe. He gave his existence meaning and taught him what it means to live. For someone who was fine with living a life with the only certainty was an accepted death Ki was the first person that made Cardia think "I want to live."