This type of relationship is very common in real life. I actually appreciate that it's more realistic to what some people go through rather than being perfect and fantasy like. I understand why you may not like seeing a relationship portrayed like this but it doesn't make the story bad, it doesn't mean there is no plot because in actuality there is. currently they are learning to trust eachother and Ho In is creating a more upfront power dynamic that wasn't there before because it probably helps him feel in control of their relationship which he didn't have at all previously. Just please, take a second to look at everything these two have gone through, not just together but with other people before and after they met. People change, a lot. Especially when they have gone through what these two have. For both of them this is a new experience and it has taken a toll on both of them. People naturally adapt to their environment and this is what they both felt they needed to do to adapt, Hoin needed to stop being such a pushover and so kind so now he is taking control and being assertive, the other one ( i really can't remember his name right now) is being submissive because before he was too closed off and trying to protect himself. His submission is him opening up and being vulnerable. It makes a lot of sense where their relationship has ended up, at least to me.