Just finished It's Okay to Not Be Okay wonder other type like it from Korea or Japan 

Legend of the Blue Sea
Bring it on, Ghost!
My Love of the Stars
Itaewon Class 
Descendants of the Sun - 2nd lead couple is where the fl is chasing the ml
Into the Ring


But tbh if you look for something most similar to It's okay to be not okay Id recommend you the Chinese drama Begin Again . Seriously the female lead and the male lead and even the story itself fits closest to It's okay

these are the ones i can think aboutif u have any question or specific style just dont hesitate to contact me:
Love to Hate You
Run On 
A Journey to Love
To the Moon and Back
My Cherie Amour
Pretty Proofreader
Hidden Love
An Incurable Case of Love
The Rain in Espana