You had been working in Korea for 5 years. You were full Japanese but came to Korea to experience work. Your Korean was broken but understandable. You had been transferred from Seoul to Busan for 2 years. You shifted in your new apartment, it was paid by your company. You saw that there was a apartment across and saw that it was locked. Sometime later, You heard the lift stopping at your floor, the 15th floor. You peeped through the peephole and saw a man wearing a black hoodie and a black mask. You were scared at first but then you saw him opening the door of the house across you, he was your neighbor.

Next day you decide to tour Busan and get ready. You step out your door and see a girl outside your neighbor's door with a letter in her hand. the envelope had hearts on it. You ask her who she is and the girl replies that she was your neighbor's 'stepsister', weird. You reach the ground floor and see your neighbor in the same hoodie and mask like before roaming around the park. You go to a cafe and meet your coworker and childhood friend, Park Jimin, who was from Busan and also transferred to Busan from Seoul. He tours you around Busan and asks to meet you soon.

You walk towards your apartment building and see your building owner talking about a society dinner by her. You decide to go as you had no friends and it was your second day in Busan. You see your neighbor waiting outside the lift and then you two shared quiet a awkward lift ride where you told him your name and why you were in Busan and he just replied 'ok'. You see the girl still standing, her face lighting up after seeing your neighbor. you quickly open your door and look through the peephole. You see the girl trying to kiss your neighbor. 'she isn't his stepsister for sure' you think. You see your neighbor putting the girl in the lift and opening his door. 'that was weird' you think.

Society dinner- You were sitting on a bench and your neighbor asked if he could sit next to you. He apologized for the girl earlier. 'My name is Jeon Jungkook' he says