Thirty but seventeen has the perfect recipe, it balances family / slice of life / romcom and even melo very well. It has its fair share of feel good moments, strong uplifting messages, emotional plots, hilarious interactions, not to forget ""CUTENESS ALERT.""..almost all the characters are an extra extra dose of cute.

The plot features a beautifuly balanced recipe of romance, comedy and melo all set to a background of a coming of age story, whether it be our heroine's belated awkward coming of age, our hero's emotional and psychological coming of age, or our sweet nephew-nim's literal coming of age.
The drama will bring you to tears constantly, both from crying and laughing.
I loved the relationship between the main characters and felt the way it developed and each respective character grew up in front of our eyes was very realistic and hearfelt.
I always appreciate a drama that makes me fall in love with its characters and wish they truely existed so I could make their acquaintance, and Thirty but Seventeen not only made me fall for its leads but nearly all the side characters. That was thanks to the fun and witty interactions, the heartfelt and sweet script, the strong on-screen chemistry, aided by a strong and believable performance from all, not just our main trio, but also their "kaseifu no mita"-esque housemaid Jennifer.
I appreciated that the romance here did not suffer from the common tropes of Kdramas, like love triangles (we only have hints nothing major with lingering repercussions like other dramas), or noble idiocy (there were certainly moments it nearly felt like we were heading that dark road only to be delighted by a sweet turn of events or a moment of truth). Above all, I loved how every one spoke their minds and didn't act like total idiots when it came to their feelings, even if that meant replying to "why do you look at me like that?" With "I don't know, me either". We watched our main leads achieve psychological growth and flourish emotionally through their relationships with each other and their "family". Any slight sense of slowness in the romance plot in the first half felt accounted for and explained, because we've come to understand the characters, and their mutual feelings of respect and consideration.
The acting was great by all the cast, it was my first drama for the male lead, and I hope it won't be my last. I totally loved him in this character.
The music was sweet, and the classical tracks were as expected played well and fitted the mood. I also liked the sound effects (like an air horn, a cicada etc), which were perfectly utilized to maximize the effect of certain moments especially comedic ones.
Rewatch value is high, I feel like I might be coming back for a dose of cuteness sometime in the future.

This was a fun and enjoyable ride which I couldn't pause once I started. I definitely recommend to all regardless of your favorite genre, because I for one have been watching too many dramas of dark-ish and heavy plots which are mostly my favorite genres, and was craving a feel good and fun watch, and this drama was certainly the perfect choice.