It's My First Time Being Possessed by a Book, So Just Play Among Yourselves

[Omegaverse, Possession, Status Difference, Non-human, Misunderstandings, Alpha Top, Regretful Top, Sweet Top, Devoted Top, Beta Bottom, Cheerful Bottom, Flirty Bottom, Scarred Bottom, Clumsy Bottom, Face-con Bottom, Unrequited Love Bottom, Runaway Bottom] I possessed a high-heat, angst-filled BL novel written by my older sister. There, I met the main top, Rupert, the main bottom, Chris, and the sub-top, Lienhardt. [!WARNING! Extinction Warning. Your relationship with other characters is fading.] Lee Ui-hyun tries his best not to interfere in the relationship between the three, but because of the warning that his existence will be erased, he has no choice but to try and bring the main c...