I, sadly, found it quite poorly developed and even unresolved, e.g. the amnesia escamotage serves as an engine to move the story forward, but at the end of the day there is not even a really plausible explanation of the triggers of the memory loss, with its 'trauma' that should then activate the relative feelings of guilt, sin, redemption and all the corollary underlying the drama itself...

I'm not saying certain 'motorist clichés' like “Winter Sonata”, 'I Have A Lover' or 'Stairway To Heaven', but something more determinant and concrete than 'psychogenic amnesia' yes, but...

Then let's talk about the pedagogical disaster perpetrated on the poor child, treated worse than a postal parcel!
Abandoned by the mother, then taken back with proterrity and arrogance, then almost gifted to the aunt and uncle, then taken back again by the mother, with the relative runaway and the poor father who, between a child-exchange with the companies' shares as if we were at the local fish market, because he is a poor idiot, finds himself having to tolerate all this, perhaps without even complaining...

Quite a bunch of relatives, they should all be jailed and social services called in....

The male lead character who at least improves his posture during the episodes, stopping walking like a complete idiot, something that cannot be said of the tedious father-in-law/father/grandfather (which for an Italian like me, is quite funny, because it reminds of the journalist Beppe Severgnini, A/N). It's really a pain for 18 episodes, this Rain Man/Kaiser Soze style pacing with relative hand scratching (enough!) that even makes our amnesiac Yu-ri explode, in one of the best liberating moments of the story...

...Now a digression has to be made: 'But what did the mother of the female character find so extraordinary about this phenomenon who is always bent over, mumbles two words in 18 episodes and stares at the floor or books she has read a million times that she would even have a daughter with her?
Mystery of the plot, she leaves the drama almost immediately so we will never know....

Rather than "Birth Secret/The Secret of Birth" the drama should be titled "Birth Mystery/The Mystery of Birth"

The other cult-moment is the incredible argument between the two friends-colleagues who accuse each other of stealing their boiled-fish boyfriend (who laughs out loud!) as well as the theft of the thesis (and who knows what else must have happened in the USA, eh, you naughty girls!?) ...

There is something interesting in the secondary characters, such as the youngest son of the eccentric family, with musical ambitions, as well as his mother, a fervent Catholic with a chapel in the house ('we rich people don't miss a thing, do we'!?), but also among the lead character's friends, especially the hopeless lovers who intersect their repressed desires with the lead couple, who would have deserved a little more space in the story...
The 40-year-old son's contrition for his wife comes too late... sorry but your beautiful bride is already on the plane

Awesome the CEO who goes from the board of directors to robots-transformer in two episodes, almost a record;
by the way, is it the soju drunk in buckets that ruins the brains as well as the rest, of the poor Koreans!?

The 6.5/10 is for the entertainment, even if 18 episodes are sincerely too many, and for the cast, really great overall with Yu-ri who is always fabulous and the formidable child actress a cut above the rest, even if making her cry so often is really blackmailing, anyone would be touched by a crying child (except for that monster of a mother-genius, of course!)
but it's still very difficult for me to want to see it again

Last personal note: The music in certain bridging scenes, curiously enough, has resemblance to some sound passages from 'My Love From The Star'.