Although the story is as insipid as one might expect from a soap opera, with its open narrative and outrageous plot twists (and blatant overuse of amnesia tropes), the cast made it enjoyable enough to hang on to the last episode (with the exception of Dan-dan's father, whom I couldn't stand).

The kids were the most adorable ensemble ever. Seo Woo-jin is a natural born actor. I swear it is scary how good he is at emoting: whenever he cried on screen, I cried too. The other two child actors were very natural as well. Choi Myung-bin is somewhat of a well-known veteran among acting children (I think I've seen her at least in a dozen different dramas) and she is an undisputed talent, whereas the other kid, Yoo Joon-seo, is less experienced yet he is on par with his colleagues and also absolutely cute.
The female cast consists of some of my favorite actresses: Kim Young-ok, as the national grandma; Cha Hwa-hun, as the greedy, scheming ajhumma (hilarious!); Lee Il-hwa, as the prodigal mother; and, finally, Park Ha-na, as the evil, crazy girlfriend. Their performances are delightful and they really tried to sell their characters with the utmost professionality but the writing was just too awful to be redeemed by their talent. Also, my feminist self left my body whenever I was watching an episode in order to avoid being shamed into oblivion.
The male characters are ridiculous, at best. Just like the plot. Personally, I endured it just to ogle at Ji Hyun-woo in suits (and out of them too...).

The main couple has a decent amount of chemistry, but their love story is problematic (and not because of the age difference).

All in all I would not recommend this to anyone I know, mainly because I wouldn't want them to realize I watch this kind of nonsense.
However, I must admit it is entertaining to watch just to discover what ludicrous extremes the writers' fantasy is going to reach.

Female Empowerment Score 2/5.