My Mate Sold Me At Her Birthday Banquet

Andrew, a werewolf, spends 7 years as a live-in caregiver for Luna to fulfill a promise to his late true love Claire-Luna's sister who died saving him. He endures countless hardships for Luna: skipping exams to fix her car, drinking spoiled milk for her, racing dangerously, enduring abuse from Luna's crush Eleanor, and even being auctioned off. Luna, oblivious to Andrew's motive, only has eyes for Eleanor, repeatedly misunderstanding and hurting Andrew. When Andrew, after 7 years, decides to end his life to reunite with Claire by jumping into a river, he survives but loses his memory and leaves. Later, Luna discovers Eleanor killed Claire and framed Andrew, takes revenge by ruining the family and auctioning Eleanor. Finally, Luna heads to find the amnesiac Andrew, who now lives a simple life by the sea, trying to make amends.