So far it is looking like it has some similarities…

So far it is looking like it has some similarities to "Fated to Love you" (and all it's adaptations) due to the whole drunken one-night stand/sleeping together plot but that's where it stops. Here, the guy seems like he really wants to take responsibility for the "mistake" but it is also unrealistic how it was so sudden that the ML became dedicated and determined to take care of the FL when in fact he was in a long-term relationship with another woman.
Will keep watching to see how this will develop.