
Now it's safe to say...
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1. No, Yoon Chiyoung won't get pregnant at all. Heeseong will be the only one who got pregnant and he's with twins.
2. The twins is a girl and a boy. The boy looks exactly like the mini version of Chiyoung while the girl looks like Heeseong. Their names are Gyeon Doyoon and Gyeon Seoyoon.
3. When the twins get a little bit older, they mistook their parents' intimate moments as 'Wolf dad bullied Dog dad, we have to protect puppy day from wolf dad!' and even made a fake report under Heeseong's name to make the organization arrest Yoon Chiyoung because they believe Chiyoung needs a punishment for bullied Heeseong. Lmao Heeseong was like 'what???' when he heard that and the parents tried to explain that Chiyoung only gave Heeseong a 'massage' to get taller lmao. The twins then apologized while crying to Chiyoung.
4. The twins are scared of thunder just like Heeseong. When their parents tried to calm them down, the younger twin said that she's not scared because Heeseong is there, and that made Heeseong actually cried so much due to remembering how he hates thunder because that's when his family abandoned him, but now he's glad that he has Yoon Chiyoung now.
That's the end of the novel!

I previously gave a spoiler here so feel free to check it!
https://www.mangago.zone/home/mangatopic/17659986/

Please remind me again why did his brother only come to meet Dojun after 10 years

He was not allowed by his grandfather to get in touch with his brother (grandfather does not like how Dojun looks like his mom and "the reason" for his son's death, so there's resentment and the likes). So to protect Dojun, he supported him financially through his uncle, while acting like the perfect grandson in front of the grandfather. He's only now meeting him since the grandpa is now weak and about to pass away, plus he has established himself, so he can support Dojun now.
For you guys who talk bad about the MC, just a friendly reminder that one day you will meet someone just like him in your life, whether you like it or not. If you can't be patient facing someone like him, please at least don't say anything rude.
I have a cousin who's exactly like him, and the worse part is they will take you as a bad person if you advised them things that make them think negatively.
Annoyed? Of course. But since I know why did they become like that, the least I can do whenever I meet them again is to act proper and not rude. Because I know whatever I say will give more damage to their already low of confidence.