Both Lost in the Woods and A Tale of Thousand Stars have a city boy in the countryside. Both series have romance and the one lead has a park ranger/officer type of job.

Last Meal Universe is a crack comedy similar to Ossan's Love Thailand. They both feature romance between men.

Also has 3 male characters interested in 1 guy; however, Light on Me is set in high school/gentler than Secret Relationships.

Similar to both season one and two of Papa & Daddy (and also from Taiwan) with taking care of a child, though Papa & Daddy it's an established couple.

Similar to FC Soldout in that it has a sport element; however, the sport is not really the main focus, the focus is on the relationship.

The side couple in Love at 7-11 has a similar plot element of taking care of a child. I don't think there's an official international release with English subtitles though.

HIStory 2: Right or Wrong has a similar plot element of taking care of a child including making meals.

Another one with a similar dynamic between the leads, one is more serious and the other is more happy-go-lucky. Also has an office setting.

Love is Like a Poison has a similar dynamic between the leads, one is a strict character and the other is a happy-go-lucky character.

Choco Milk Shake and A First Story both have some really sweet and fluffy vibes. They are both produced by the same company Strongberry.