That's not a fair comparison. He was groomed and abused by her to obey. The wife on the other hand did it because she was horny.
Now hold up, in the beginning Hajin was physically and verbally abusive to Si Yeon. And Hajin is literally a murderer but somehow the wife is the worst one bc she sought the comfort she wasn't getting from Hajin? Plus when SiYeon tried to tell him that she was cheating, he chocked her out until she said she just got fried chicken??? I love Hajin but he's just as flawed as everyone else. Cheating is wrong 100% but I can see why she did it.
The reason i mentioned only the wife is because i kind of feel bad for Ha Jin? He was forced into this life, it was either obey or die. Si Yeon could have just left when she found out that he can't give two shits about her, why stay in an unhappy marriage and cheat when you can leave and find another person? But still, i don't favor Hajin over Siyeon, because he too could have just stayed with his boss or Haree, i know it's for cover but it was wrong of him to marry her. When someone decides to be a Hitman the know what they are signing up for, so they should never get involved with oblivious civilians even for cover because it will always comeback and bite them in the ass, hard.
This story would have been so beautiful if that bitch didn't cheat on him. I mean she doesn't deserve anything he is doing for her now. No matter what, there is no excuses for cheating on your husband/wife gf/bf, if you are unhappy just fucking leave! Break up or get a divorce!
Update: a lot of people misunderstood me thinking i think Hajin's cheating is okay and Siyeon's bad. I just didn't want to make this comment long, but here what i think
The reason i mentioned only the wife is because i kind of feel bad for Ha Jin? He was forced into this life, it was either obey or die. Si Yeon could have just left when she found out that he can't give two shits about her, why stay in an unhappy marriage and cheat when you can leave and find another person? But still, i don't favor Hajin over Siyeon, because he too could have just stayed with his boss or Haree, i know it's for cover but it was wrong of him to marry her while doing what he does for a living+he wasn't in love with her. When someone decides to be a Hitman they know what they are signing up for, so they should never get involved with oblivious civilians even for cover because it will always comeback and bite them in the ass, hard.