Da Hei and Xiao Bai meet when moving into the same apartment together. Xiao Bai is focusing on his graduate studies along with his reconnaissance job, while Da Hei takes on odd jobs to fund his little sister's medical needs. As their lives start intersecting, how will their relationship develop?

Xiao Bai takes the initiative to admit his love to Da Hei, which gradually closes the gap between them, and Da Hei begins to develop subtle feelings for Xiao Bai. However, will their feelings get in the way of their respective duties?