True Beauty it's definitely a must watch for MGY
Although it's typical full of cliches drama but was refreshing.
Find me in your memory is another one although the age difference between the leads didn't set well with many people.

If you don't mind large age gap in romantic pairing, Find Me in Your Memory is a good one. Solid on the romance front, and satisfying enough on the friendship story and workplace dynamic.

Try KBS drama special Waltzing Alone for a totally different character type than what Moon Ga-young usually played. A very unusual exploration about romantic love.

I love Moon Ga-young so much. She is gorgeous, talented, and has such a winning personality.

Link: Eat, Love, Kill was in casting purgatory for a while, but I'm thrilled that they cast Yeo Jin-gu and Moon Ga-young whose chemisty is through the roof.

As for the question, old but https://www.dramabeans.com/2019/04/actor-spotlight-moon-ga-young/

Honestly, very few of her dramas are actually good, but the one thing they all have in common is that Moon Ga-young absolutely steals the show. She’s phenomenal - no matter what role she’s playing or how bad the drama itself is. She’s a true star in-the-making.

So my recommendation is that if you’re watching a drama just for her performance, you’ll have a good time with anything. She’s really that good, IMO.

I’m really enjoying Moon Ga Young in Link as well! She’s able to show so much emotion and humor at the turn of a dime and I love seeing how she and Yeo Jin-gu seamlessly transfer their feelings via their emotional link. I think Link is her meatiest role to date, she really is able to convey the fear of a woman who has been stalked and assaulted while never losing the viewer’s sympathy because of her essentially bright and effervescent character.
Find Me In Your Memory is a cute rom com though it dragged for me in places. She had great chemistry with Kim Dong Wook, they made a cameo together as their characters in Shooting Stars. She also received an acting award for Tempted, which was based on Dangerous Liaisons (I have not watched Tempted myself).
I thought she was very funny in True Beauty but didn’t quite buy her as a high school student. My teenage daughter loved True Beauty though so perhaps it’s a age difference .

The first time I noticed Moon Ga Young in Tempted or Great seducer. She and Woo Do Hwan were electrifying together in first episode but I can not recommend that drama to anyone. I did not even last beyond two episodes. That drama was train-wreck and even presence of three talented actors could not save it.
The only other drama of hers I have watched is True beauty. That drama was your typical webtoonish trope fest and the role was piece of cake for her. If you want some fun time, Moon Ga Young and Hwang In Youp together, go for it.

Loveee Moon Ga Young!!

She was a side character in Live Up To Your Name, but this drama was awesome so I would recommend it for the overall story and seeing her act in an uncommon role.

2521 anyone?