Xiao Bai learns that the place where Da Hei has been working may be a front for illegal activities, and is tasked with investigating Da Hei. Da Hei also notices Xiao Bai's unusual behavior and becomes more alert. While the two of them are testing each other, Da Hei's grandmother suddenly arrives at the apartment.

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?

Xiao Bai gets injured because of Da Hei, and while tending to his wounds, DaHei ends up getting drunk to stop Xiao Bai from drinking. This interaction leads to a change in their relationship.