I Lost My Memory and Found Out I Was a Jerk

I woke up in a hospital bed with handcuffs on, suffering from amnesia. I was told my name was Lee Ja-sung, then sent straight to prison before I could figure out what was going on. That’s where I somehow met Jung Chung. What do you mean, my big brother is Han Jae-ho? And who’s Lee Joong-gu? I was married? And got divorced? Can somebody tell me what on earth is going on?