After celebrating his sister's wedding, Rheymart falls headfirst into the river by accident. When he wakes up, he transmigrated into the ABO manhwa his sister's made, as Lahn Vanden who will suffer on his heat and die at the end. Before it happens, he swears to avoid the Billionaire Alpha Lixue Blake the source of his suffering. "I must never cross paths with him." However, he caught the attention of the worst person possible. "Rheymart, you're doom!"