The washbasin in my house was leaking water.
(T .T)
So I thought, "Let me fix it myself,"
At first I thought it would be repairing only water leaks, but
I tried to replace the washbasin.
I tried while watching other people's YouTube.
You can do it unexpectedly.

Purchased vanity: TOTO KC series made in Japan
I bought it at a home center.