Cha Seo-Jin falls in love with Han Yi-Kyung, the older brother who lives next door with her since birth. Seo-Jin, who gradually develops feelings for him, confesses to Yi-Kyung, but he rejects him, saying he likes him as his younger brother, and they lose contact after their high school graduation. Then one day, Yi-Kyung and his son Gyul appear in front of Seo-Jin while he is out viewing cherry blossoms. The two quickly become close again, making the time they spent apart seem meaningless…

"Hyung, you have to hold back your noises. What if Gyul-woo wakes up?"

(Source: Bomtoon, translated)