A noble's son was traumatized at a young age and spent 10 years basically as a complete hikkikomori

Just hiding in his room sleeping

Then one day he receives a vision of a master swordsman who spent a lifetime perfecting a single strike

And suddenly he gets the motivation to break out of his isolation and start training in the sword

Okay so he's basically not talked to anyone from ages 5-15

So he's a little socially awkward

But his newfound determination gets him going and he ends up going to a fancy swordguys school for a year and makes some friends

Then he goes back home and a mystic helps him awaken to the mystic arcs because she was impressed by his strong heart

And he enters a mystic realm where he just continuously trains for 5 years

Then he wakes up and

Time Didn't Stop

5 years have passed in the real world too

So this kid had a normal childhood for 5 years

Then hid in his room for 10 years

Then spent 1 year going to sword school

Then immediately vanished back into isolation for another 5 years

He's 21 but he's had like 6 years of socialization

A person would not be a functional adult with this life

I'm only reading it to collect icon material because one of the characters looks almost identical to Bai Lin

or at least prety similar

six years of socialization, much of which was literal infancy

She's got shorter hair than Lin but also I haven't seen her since the 5 year time skip