
I’ll try
So in the past, when Yisin (MC) is working and managing a company (probably his family’s company) he encounters a case, where another company that sign with them went bankrupt. From what I understand, the MC wanted to pay the promised money to the workers of the bankrupt company, but his decision was against his friend, Jintae.
However, in the end Jintae follow the commands and told MC that the money was paid. One of the receiver was Director Yoon’s father. Upon hearing that the father will receive money, loan shark went to look for him and he ended up dead. So Yisin feel guilty because it was his decision to give the money.
After he met Director Yoon (the little boy), he found out that the father never received the money. Jintae fake the documentation. That’s why the little boy call Yisin a liar. After the death of his parent, the boy (Director Yoon) had to settle his parents debt and now looking for (maybe) a revenge.
As for what happened to the MC after that, what happened to Jintae and Sangtae, who is Hyeop actually…all of this is still mystery
I swear it’s not so complicated, reread it and you should be able to understand the plot
Also how all are you all to get shocked by a 30yo