Both are GL
GAP is definitely more goofy than The Handmaiden but both are good in their own ways
GAP (2022)
Related
Both are a gl series based on a Chao Planoy novel. Most importantly imo FreenBecky and LMSY both have the best chemistry I have seen so far. They both have characters who have known eachother since young and both series are somewhat of a slow burn romance. Both gap and affair have two women where one is of a higher social status then the other.