Way back 4 years. 
When everything was getting alright, 
you are a happy-house wife, taking care of your family. 
Your one year old son and your boyfriend Yoon doojoon
The company was getting better thanks for his help, and now he have his first business trip, he was going to japan for five days, at first doojoon want to bring you and jinho with him, but your doctor suggest not to take your son on long travels yet. 
He was on the edge of canceling the business trip but you assure him that you we're going to be alright. 
Jiyong promise him too that he will take care of you until he came back, 

doojoon didn't failed to call you every hour, checking if you and jinho we're fine, at first you found it sweet but when he calls you in the middle of night you scold him, telling him to stop and you will send him a message when you wake up, Doojoon succeed on his business trip, his fellow ceo and investors held a small party, he can't declined their invitation so he ended up on the club with two girls touching him all over, 
doojoon didn't like it at all but one of investors insist to enjoy just for tonight, 

after an hour one of the girl left to entertain other costumer the only left was the girl with blonde hair, she keep giving doojoon a drink after drink causing doojoon getting drunk at that night 


And when he wake up the next morning, he was laying on bed with that brunette, Still shock and stunned doojoon manage to gather his things and hurriedly left that hotel. 

Guilt was eating him, 
he regret the night he agree to came on that club, he regret letting himself get drunk. 
When he came back home, he almost die seeing you and jinho waiting for him with a smile 
Guilt started to take him over, but he can't confess his s