Jun-won, who is a denial by person, falls in love with his straight older brother, Jae-hyung, who is educated in the same way, and finds out that the relationship between Jae-hyung's people around him is unusual. Jaehyun and his ex-lover Jiyeon, who is his older sister, are more interested in Jaehyun than when they started dating, even though he found out about his unrequited love. I can't quite understand what Jaehyun is thinking despite the strange hostility felt by Wonwoo, who is always next to Jaehyun after his older sister, and the negative story about his brother Hyoyoung. Relationships that seem to have no problems on the surface become strangely entangled when they fall in love with Jaehyung...