I assumed the MC was related to the mom but no. I'm so lost.
Susuka's mom? the person he refers to as "that woman"? If so, then yes. She's his bio-mother who was married to his dad. she had an affair and left both of them to be with her lover. Now years later they're trying to get him to help out their kid and also dropping the bomb that his dad isn't even his bio dad and that he was the son of that lover she cheated with. so if true, Susuka is his 100% blood sister, which they've known all along, but are only just now reaching out to him because he could be a good donor match for her illness.
Thats.... super wild and unfortunate. She left her own son with his father (whom is actually his step dad unaware but she knew) didn't even reach back out at all since she was happy but now that MC actually sister need a donor they ask him.. super fucked up in my opinion, I see why MC is crashing out on his dad
After read up to the current chapter (45) I really don't care for the wife at all. I overlooked the age gap thing mainly cause it's fantasy and that they in another world different culture etc, I knew she was an op the moment they met and now it's even more apparent now. I can say she pretty devoted to her mission even as far as to sleep with mc











This story should've ended when they got married but now it moving forward to side characters getting together for what? Also, the story is a bit dull now with honestly no plot as far as I can see since then.. I may seem like I'm being a downer but I honestly don't see any highlights really.