Contract Romance For An Ending

Lee Sungyoon is a 34 years old single divorcee. Now in his third year of divorce, the people around him are telling him to date again. One day, Sungyoon runs into famous author, Seo Hyunsoo, by chance at a bookstore. When Sungyoon and Hyunsoo were in high school, they had a close senior-junior relationship, but then Hyunsoo one-sidedly cut off all contact with Sungyoon! To celebrate their reunion, they both have drinks together but the next morning, Hyunsoo faints due to alcohol poisoning. After finding out that Hyunsoo has fallen into a slump, Sungyoon feels guilty and declares that he will help him. For the sake of the romance in his novel, Hyunsoo unexpectedly suggests for them to be contract lovers!A contract' that will only last until his novel ends.What will be the ending of their relationship?