Cover full cuz it's so beautiful it's hurt TT-TT

The immortal sinner who lived for over a hundred years was fundamentally weak-hearted.
Therefore, when he found out that his student, whom he regarded as his own child, had deceived him, he felt more sadness than anger and chose to go into hiding instead of seeking revenge.
10 years have passed like that.
The problem was that he had more than just one disciple.
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Disclaimer: I love this one but don't know a single Hanja so this is my attempt to read it. Translate directly from a translator with some minor beta so please don't expect much.
This contains translations of the first free 25 chapters from Naver:
https://series.naver.com/novel/detail.series?productNo=10056687