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.
Both are Thai gl. Both are written by the same author Chao Planoy, and take place in the same Universe. Both are a gl where we have two friends who secretly have feelings for eachother but a man get's in between them and once the girls finally get together the man turns into a obsessive/dangerous person.