Totally agree, their part were far more appealing than actual leads interactions.
What’s with Secretary Kim is similar (Boss-Secretary relationship) but not the same. I did really like this one drama called Somehow 18 where ML tries to prevent FL from committing suicide [its very short and sweet].
https://www.youtube.com/watch?v=XUm7XV77Xmk&list=PLjNRxXCFA7_bma8KnZ184t5YvRbv91_Xz&ab_channel=dramacat
Link: https://dramacool.so/drama-detail/somehow-18