Moon Chin Hwa felt betrayed.
Kang Chin Mae came home with Moon Chin Hae. Those two bastards helped Young Jae. Then took away his opportunity to get investment using his sister. Now he only realised all of this happened because his grandfather was in cahoots with them. He wanted to teach everyone a lesson. All of them.
Moon Kwan, his grandfather, should realise no one could be qualified to be the Moon family heir but him. To achieve that, he wanted to get rid of every possible threat. All of them have to die, and then his grandfather would turn obedient and hand over all the family heirloom and inheritance to him.
