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Well, in my opinion, it's not like Sejin knows that Ido is doing his redemption arc. Sejin doesn't even know Ido. Good things doesn't roll to you without a price. Plus, Ido is being secretive and hot and cold. So of course Sejin doesn't react to Ido positively in the latest chapter. In working world in general, it's always about being the prey or the predator. Not only that, Sejin's whole self-esteem is on the ground. What do you expect of people with negative perspective to see? Positivity? Nah. All they can see is negativity. There's a lot of things that needs to be considered before we just chalk it up into a simple conclusion that Sejin is annoying or being ungrateful to Ido for still trying to help his family despite being abused and that he does not see himself as a victim or it's all a miscommunication.
Also, what Ido is doing now, I don't think it's propotional to what he had done in the first life. Well, at least, that's what I think.
¯_(ツ)_/¯