Both are SCIENCE ROMCOMS, where 1 or both leads are Scientists/scientists in training. In FILWAScientist it's Biology&Bioengineering solutions to diseases, in Potato Lab it's Food Science.

Both dramas focus heavily on Science and solving social issues through researching scientific solutions.

When the Stars Gossip: Human diseases and reproduction.

Sunrise on the River: Enviromental issues.

Both dramas are for open-minded people and people who prefer unusual plots, conservative sensitive people stay away.

Both are romance dramas with a Hotel Setting in the background, in one the FL's family runs a hotel and the other it's ML who runs a hotel.

Both have the same basic plot:

FL returns to her hometown, where she meets again her childhood friend/crush, which then develops into an adult romance.

Both have same basic plot:

A highly career-oriented FL returns to her hometown and meets her childhood friend/crush there as an adult and it develops into a romance.

WLIS has excellent writing and on fire chemistry. Hopefully MC will be as good.

the US tv series Salvation (2017. Netflix), which has 2 seasons in total, is also scifi with some romance. And similar romantic situation of one of the 2 leads stealing the other lead from their unworthy partner.
#PartnerStealing Trope

Plot of Salvation:
A Fatal asteroid is nearing earth and
The ML a Rich Innovator + FL part of US Governemnt (&others part of their Team) have 6 months to try and save humanity.

If you like the combination of Scifi + Romance , you might like both.
Both are available to watch on Netflix.

Both have an orphan ML with abandonment issues and terminall illness with a love story.

The scars of the ML of Mr Plankton has brought back memories of the poor traumatized ML of the Classic old kdrama I'm Sorry I Love You, both are messes.

Both deal with traumatized characters and show realistic flawed humans, similar quirky vibes. Both are deep dramas.

Theme in both dramas is INTERCULTURAL DATING,

ML & FL are from different countries.

In WCAL it's South. Korea and Japan,
it's a modern realistic setting.

In FJS it's Thailand and a made up fictional country, set in fictional historical desert setting with different kingdoms.

Both are 20th century historical korean dramas, with a setting/theme of theater as central part of plot.

Musical theatre/Theatre a central part of plot in both.

Even the actress (Kim Yoon Hye) is playing a side character in both.

I think anyone into theatre or musicals could enjoy both.