Set in 2006, the story follows the deep friendship between Go Yoo, a talented basketball player, and Go Joon-hee, a brilliant student who is physically frail. Their bond is tested when Go Yoo decides to donate his kidney to Joon-hee, leading to a phenomenon known as cellular memory, where Joon-hee begins to adopt Go Yoo's personality traits and habits. The conflict intensifies when a mysterious transfer student named Han So-yeon enters their lives. Both friends find themselves falling for her, creating a complex love triangle that spans from their high school years into their adulthood. As they navigate the challenges of love, health, and identity, the series explores the enduring impact of their shared past and the sacrifices made in the name of friendship.
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Television Guide
The inaugural season follows the intertwined lives of Go Yoo, Go Joon-hee, and Han So-yeon as they navigate the complexities of friendship, health, and romance in 2006 and beyond.
Ensemble