I went into The Forgotten City completely blind and found it to be very compelling and creative experience that I didn't want to stop playing. I hope you enjoy it if you decide to buy it!
Dave the diver is a blast. The premise is simple and fun but it's constantly evolving and building on what's there with a charming cast of characters and events. Id highly recommend it.
Some quick searches suggest Nexon having a pretty poor reputation on account of aggressive micro transactions/loot boxes. That is pretty shitty behavior for sure.
I wonder if purchasing a game like DtD, a game without such poison, is helpful to send a message that people like games without these predatory tactics.