Okay so the lady wanted Shi On to pay his debts...
And Hong Seok had a house. He could have just sold the house and paid the debt, and then move in with Shi On....they were living together anyway. Instead of that, he decided to make an unreasonable deal with the lady- "I'll move to another country if you just let him keep the house". Apart from this, this is good enough....there are some soft and cute moments. The ending was unsatisfying. I was like- "This is the last episode? The relationship just started T.T "