Humans when presented with hope, chances are, they take it. If an opportunity opens, we walk through the door, thats how it is. That said, that's just in the past life. In the current life, there are a lot more open doors so expecting this kind of plot should be smth easily predicted by now but its admirable that the mc is resolute despite being shaken some times.
Also we're not in the modern world setting, a psychiatrist is a more luxurious than a luxury.

It’s crazy how so many of these romance webtoons just have the “I can fix him” plot line.
Idk who needs to hear this, but no, sis, you cannot. He needs a therapist not a relationship.