you two were living in a world with a lot of monsters, they are killing people and Joonghyuk was the hero who save the people

you are Joonghyuk’s ex girlfriend, you two broke up but you two were still talking if you two see each other. you found out that you are pregnant his son. you didn’t tell him and years went by, when your son was 4 years old you decided to tell him your son was running in a long bridge as you two were walking and talking “Joonghyuk,I have something to tell you…” you said Joonghyuk:”hm?” after that you explained everything to him and he looked at his surprised. as he stranded up to walked to him suddenly a very big monster’s head came out from the water and eat a part of the bridge that their son was on it. their son died in front of their eyes in a second