Somebody explain this webtoon to me it

I kind of read the Raws and i think ....The fatehr and daughter kind of like trapped in each other body...Basicly kind of like split peronality(but they are literally trapped)And only onw of them can exist at one time.. and they both have a trigger which makes the other body come out? and later on they try and reverse what happens so that they can have a body of their own again but accidently they do something else

Thanks man