The Grudge

After being betrayed and murdered by his fiancée, the gang's young leader, Charles Ji, accidentally time-traveled back thirty years, ending up in the body of a 19-year-old boy. This fallen young Alpha is then rescued by a gentle, kind-hearted young Beta. Yet this angelic savior bears the exact same face as the fiancée who murdered him in his past life...

(Source: WebComics)