It's My First Time Possessing a Book, So You All Have Fun

I was possessed by a high-level, run-down BL novel written by my older sister. There I met the main gong Rupert, main gong Chris and sub gong Lianhart. [!WARNING! Disappearance warning. The relationships with other characters are blurred.] Lee Eui-hyun tries not to get involved in the relationships of the three of them as much as possible, but because of the warning that his existence will disappear, he has no choice but to continue the main couple as in the original story. However, in the process, he notices Lianhart who seems to get hurt. It seems like I keep getting entangled in bad ways with Lianhardt, and our relationship isn’t getting any better, but is eventually on the verge of ex...