similarly to you i have also been away so I am anticipating what will others recommend :)
I recommend SKY Castle it has almost all your preferred genres and it created a lot of buzz when it was airing. It'S from JTBC so it had usual cable TV viewership ratings when it started airing (around 2.0%) but then it became one of most watched cable dramas in the history (nearly passed 25%)
I am also currently watching WWW: Search and it is really enjoyable adult romance + sismance + office story
Tomorrow starts airing IU's newest drama Hotel Del Luna and it looks pretty interesting - i'm anticipating this drama a lot.