Because This Is My First Life

Obviously, both have Lee Min Ki in it. Although BTIMFL is more preppy and happy, they both are in the slice of life genre, showing the events in the mundane lives of normal people. They both discuss certain topics that are quite relatable to the public, like insecurities, societal pressures, relationships and their fragility, workplace toxicity, and just the overall hardships of being a broke young adult with nothing to your name.

Both these dramas are about a group of female friends. While The Best Moment To Quit Your Job is about women in their 20's making their first step in the professionnal world and and their subsequent struggle to adjust, Because This Is My First Life is about 30 years-old women we follow as much as in their professional than personnal life.

Also, TBMTOYJ is more of a slice-of-life drama, BTIMFL is a romantic comedy with depth.

Exploring adulthood, maturity, dealing with emotions, actions and life in general.
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Both:
Deliver in-depth messages relating to life, marriage, relationships (similar themes)
Focus on being true to their emotions
Focus on character development
Involve different relationships

This might seem like one that people might not think of. Both stories are about a man who is generally well off, though one more than the other. They each decide it is for the best to enter a contracted relationship. Pushing off unwanted attention from family and from blind dates. They women obviously getting their fair share from the deal. Of course the first rule is NO DATING, but we'll see how long that holds up. The women take the opportunity to re-evaluate their lives, where they are, what they want, and what kind of person they are really looking for. The stories end nice and clean and cute, and are both fairly simple, dealing mostly with regular relationship problems.

One Spring Night and Beacause This is My First Life have the same realistic feeling about life and romance. Story is calm and heartwarming.

Both have funny scenes and focuses on 3 different relationships. Both have a mature romance feel to it. If you loved one you'll definitely love the other!

try this, there are high chances of enjoying this
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Both center on ordinary working adults stuck in corporate life.
Explore financial struggle and survival under capitalism.
Characters feel existential burnout ..
Romance or connection grows ..
Mix humor and melancholy to reflect modern adulthood’s chaos.
Use a realistic, slice-of-life tone instead of over-dramatic plots.

Both drama's explore the personal struggles of adulthood. They both give an insight on the struggles of a woman against society and the perception on how they should be living their lives. Both main female characters live together with the male main character as well as focusing on other supporting characters that have their own struggles.

These dramas have a similar overall pace. They start with certain events that work as catalysts for the main plot focus, they have significant character developments and they explore questions that relate to love, family/friendships/work/romantic relationships, while characters are still learning about themselves.
The couples have amazing chemistry too!

1. Cold aloof male lead and cute female lead
2. Male lead had a previous relationship.
3. The female lead likes the male lead first.
4. Male lead is 7-8 years older than female lead.

Arrogant difficult nerds whom have been hurt with love, but find a new romance that brighten their lives.

Both have arregent hard to deal with nerds who have been hurt with love, but find romance in the most unexpected ways.

both main leads werent exactly on friendly term when they first met

have multiple couple, weird how exactly there were three couples

but what most similar between both drama is how through those ordinary characters they tackles real life everyday issues and explore human relationship in such an interesting way, though the plot and may seems cliche sometime but they have their own very twist that will leave you grinning by yourself.

both drama also revolve around marriage (not just dating as how most drama are) issue and how society view them

tho both ROMANCE COMEDY genre but actually they have a much deeper story than your usual romcom

another trivial similarity : both male leads failed their first marriage, main leads somehow end up living under the same roof.

Both Dramas deals about Marriage and Relationships, Divorce, Close Friendship, Second Lead couples and delivers relationship hardships and comedic slice of life story.