Nuthin' like the fangirl style of Jang Hee-ryung as Baek Da-hye in Sh**ting Stars. She's utterly adorable living out her fangirl fantasies of clooooosely working with the heart-throb Gong Tae-sung...while also being really good at her job!!

In Healer, Chae Young Shin is a fangirl for Yoo Ji Tae as a reporter and Healer.

The only one coming to mind other that what fellow beanies mentined and the ones you watched is Heveanly Idol. But it is a hot mess, at best.

Search: WWW Cha Hyeon (Lee Da-hee) fangirls over her favorite actor Seol Ji-hwan (Lee Jae-wook) and buys a gorgeous subway ad (the railway system, not the fast-food restaurant) for him with a message that will make you cry. Also, Bae Ta-mi (Im Soo-jung) was a "national producer" for her one-pick on Produce 101 Season 2 and cries over the "Nayana" piano version like all fangirls do.

There are a lot of normal fangirling/fanboying in any show that features an actor, writer, idol, reporter, chef, or any other successful/prominent job.
But Wild Romance takes fangirling to a whole other level! 😄

The whole family are fans of one baseball team, and fierce anti-fans of the leader of the rival team. Their dedication to their bias, and their commen sense, and how these affect their lives are shown in a very hilarious, intriguing, and shrewd way.

P.s. for my friend @reply1988: it's also a kinda psychological thriller.

Castaway Diva. Mok-ha is Ran-joo's biggest diehard fan.

Her Private Life is the drama that immediately comes to mind.

1% of Something. Dada is a fan of Jisu, an up and coming singer. It’s more of a fan plus noona/mentor relationship, which is sweet, loyal and supporting.

Does Reply 1997 count?

The H.O.T-Sechs Kies fan wars were always hilarious and I will never forget that one episode where the whole auditorium went completely silent when both groups didn't win the grand prize😂

In Man to Man, the FL is the successful fangirl of the sort of SML/second lead who now works as his manager. The FL is an intense fangirl, but the fun of the drama is all about that hilarious bromance between the ML (Park Hae-jin) and second ML (Park Sung-woong)!!!

The show that comes to mind is Secret Garden. While fangirling is not a super central part of the story, the main female character Gil Ra-im is a fan of idol-oppa, Oska. I even remember her having "Oska socks". Heh!

In God's Gift: 14 Days, the daughter's fangirling is key.

It's not a central part of the story but it has its relevance:

In Hometown Cha Cha Cha the cafeteria owner's daughter is a fangirl of a fictional idol group called DOS (later the two idols go to the town to participate in a variety show).

1. The Best Hit.
The ML is a big fanboy of himself. He's an idol, then he travels in time and becomes his own fan. Kinda.

2. W.
The FL and her boss are fangirls of the ML. The ML... does sports.

3. Tantara (the entertainer).
The FL fangirls over the ML or SL. I don't remember. This one is in the music industry too, but they were a indie band and managers... Tbh, I don't remember.

4. Cheese in the Trap.
The SL goes full on sasaeng on the FL. 😂 It counts? He literally was EVERYWHERE. Wouldn't leave her alone.

5. Jealousy Incarnate.
I think the FL is fan of the ML and the SL is fan of the FL.... Something like that.
They're anchors.

Chicago Typewriter! Jeon Seol is a major fan of author Han Se Joo.

The Harabeoji in The Business Proposal is a fan of the fictional makjang drama Be Strong, Geum-hui.

Also Ahn Yo-na in Kill Me, Heal Me fangirls over Omega.