I say this as someone who likes the ntr trope, IT SUCKS!
The thing about a cheating trope is that it must be somewhat justified or have the thrill of getting caught but in this story none of those two things happens. The MC nerves gets caught and doesn't have a good reason to cheat more than to be an asshole and still gets saved from all the shame thanks to the boyfriend he cheated on! It doesn't matter that the manhwa tries to justify it by saying that the cheated boyfriend was a bad son, the mc and the ml are still selfish assholes that doesn't have anything good, not even their relationship. This story might be exciting in the first two chapters but the story lacks depth to want to continue reading the other 70 chapters

THIS WAS SO GOOD everyone saying its bad just for having the cheating trope is just an idiot. if you dont like a trope then just dont read it! It's like saying you dont like a salad because theres tomatos in it. Just go eat a salad without tomatos???