I watched this drama because I saw the two leads in CLOY and WYWS. They even mentioned While you were sleeping in the 1st ep.
The leads have enjoyable chemistry and I found their desperate quest to remain together to be endearing. That is until it began to fizzle out due to the mother's incessant badgering. After a while it made Son Ye-Jin's character seem miserable abd as much as I wanted the leads to be together, I found the ending to be unbelievable. I think the writers regretted the sad ending and just threw a happy one at us that didn't feel quire real. Some would say to watch rhe show until ep. 9; that's when it begins failing, but I'm glad I stayed the course. If you love the cast enough to begin, then ffinish it for yourself.