Sakuraruu

The MC was very OP. This is kinda murim story.
He reincarnated as one of the many heirs/successsor to a big clan.
One day he have to went through a test with other kids his age.
Each group have around 4 children(?), they have to enter the Zhuge(?) people made space.
Then, this Zhuge guy was bribed to make sure MC fail or die.
But MC was like just wave around to slice open the space and get out...
Long story short, later on he became the head of the clan, and his mom became the temporary clan head(?)
He also helped this other lady (his friend's sister) from the extreme yin sickness(?)
And then once the lady get healthier, she looks so beautiful that MC fall in love.
MC only like that lady and think of other flirty girl as pebbles.

MC is born beautiful, rich, kind and genius blondie.
He got older brother who have inferiority complex.
The brother have multiple operations to become as beautiful but everyone knows his face looks so fake.

MC in high school(?) Have a friend(boyfriend)(ML) he is close with.
But due to the jerk older brother scheme/fault, MC got into accident while riding motorcycles on the way to meet his ML.
And then ML who were waiting, got beat up by people hired by older brother and to tell the lie that MC is the one who ordered that.
Meanwhile, MC woke up in hospital lost his memories and his intelligence and became slightly idiot.
....
Couple years later, ML who is now rich and quite powerful, met MC to revenge.
Long story short, ML found out what actually happened and helped MC to be free from the clutch of the older brother.
....
Please tell me the title.
I forgot to bookmark it.