Hyunjin, a really fun boy, dance lover, aspiring to be a famous choreographer, considered his life totally amazing, his dad, the only family he had, and his two friends who were a couple, Lee Minho and Han Jisung, they loved each other so much that Hyunjin envied them and daily wondered if someone was going to be able to love him as much as they both love each other... but one day while he was stressed and dancing to de-stress, his nose started to bleed, which he didn't find strange, a year ago his nose was bleeding out of nowhere, so he wiped the blood with his shirt, but it kept coming out, more and more, until he finally calmed down, he decided to go home and already in his room, the bleeding came back, and it didn't stop until he fainted, his father, who was at home saw him and took him to the hospital only to discover his condition. When he got up, he saw his father in a chair crying profusely. “Dad…. why are you crying? what am I doing here?” “My son….” Doctor Changbin came in and upon seeing him, Hyunjin said that he felt fine and wanted to go home, until the doctor spoke, very seriously… “Hyunjin, don’t you really know your condition? Your nose has been bleeding for a year, right? Why didn’t you come? I won’t beat around the bush, it’s not fair. Hwang Hyunjin, you have leukemia, and we can’t do anything now….” “You don’t have much time to live, we can still try with chemotherapy, but nothing is guaranteed…” And so, Hyunjin’s life continued, he went to chemotherapy but then he stopped, when his friends found out they cried their eyes out, they shaved all his hair, and one day while his friend was giving a concert (yes, Minho was an idol in the middle of his debut) he went, and there he ran into someone, colliding with someone, without paying attention he asked for forgiveness, although he thought that person had an unmatched beauty. Months later, in the practice room, while he was dancing until he was tired, he heard applause… it was the same person he had bumped into at the concert. “Who are you?”