people calling mincheol a "complex" character and the complexity is abusive, gaslighting, ...

I guess they call him like that only because author was quite good in portraying the phycology of this shitty cheater. Usually they make them plain and like made from the cardbord. But here we can see a little wider spectrum of that shitty personality. So compliments to the author they created a real person (real shitty cheater person with disgusting reasoning, but still)

True, we can see how the mind of an abusive person works the author reallly did well on that part