actually the manhwa seems to be cut off, in the novel Yanyan want to use the tie for himself but He Yang said he don't have to do that. but Yanyan said he don't want He Yang to see him so he use the tie on He yang.
Spoiler!
even when they have s** later, Yanyan faced the bed cause he don't want He Yang to see his face and he don't even wanna see He Yang's face. but when He Yang want Yanyan to face him, Yanyan use the tie on He Yang.
