This is my take on lovely runner so you don’t have to agree with it.
I couldn’t help but notice alot of similarities in plot of the movie 20th century girl and lovely runner. I will be pointing out those similarities because there are just soo many. I almost thought lovely runner was a drama adaptation of the movie with a time travel twist.
Firstly, Sunjae death in lovely runner and woon ho’s death in 20th century girl.
Secondly sol’s character had resemblance with Bora who is effortlessly cute and cheerful in the movie. Unfortunately Sol didn’t make us feel that way. She was annoying to say the least.
Thirdly , we discover Sun Jae fell for Sol first and same happened in the 20th century girl. The aesthetics, the video rental shop and the neighbourhood are similar too.
Finally , the love triangle that builds confusion between Sun Jae and Sol and it continues up till the middle of the show. This also happens in the movie. i feel the writer was either inspired by the 20th century girl or it was just too much of a coincidence.(LOL)

I absolutely love sun jae and I was rooting for him but sol ughh. I don’t know why but she annoyed me throughout the show. I don’t understand what was she trying to do as her actions were abrupt and not thought through. Poor sunaje suffered much for her.
Anyhow i might not rewatch the show as story was lacking depth.. Sol’s time travel and sunjae’s death keep repeating in a never ending loop. It was bizarre towards the end.