
Best manhwa that completely delivers the emotional part of characters, you hate them, you see their backstories and you see how they develop step by step and their regrets and understand them and you love them at the end. That's how I ended up to like that bully asshole ML lol.
Anyway this is the best story where I truly past bullie's guilty feelings and I could accept their apologies.

Plot twist!!
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- Note: Keep in mind Cain actually speaks very fluently in Korean, but specifically hiding it from Jooin...
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Cain and Jooin, They have been in master and servant relationship in their previous lives, in historical periods. Jooin was noble family young master and Cain was his servant/bodyguard/knight in shining armour. Cain was foreign born and sold at a very young age to Cheoson (historical Korea name) and became Jooins servant and growing up together fall in love with him promising he will keep his master safe and protect him in all cost. And Yahwi was crown prince that also had a "THING" for Jooin and at the end was one of those who hurts Jooin s feelings and was the reason Jooin died. And Cain also left heartbroken for not being able to protect Jooin from death.
So being reborn/reincarnated Cain remembers their past life and after seeing Yanhwi together with Jooin on abroad, I mean in hotel, he decides to follow Jooin to Korea as he knew that same things as in past may happen. And negative things actually start to happen.
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And last plot twist:
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This is just my GUESS not an actual story lol. ╮( ̄▽ ̄)╭
Yo~ Cain was a dog in his past life. Its officially confirmed lol. I suppose Yahwi was a cat then mheheh