anyone has experience how to fix this? I guess the sealing rubber material inside is broken. but don't know how to unmount the tap from the sink, anyone has any idea??

Thanks thanks!

There is a big nut underneath the sink that mount the tap.

You need a wrench or extended spanner to unsrew that nut to replace the washer.

The big nut is to hold the tap in place, if there is no need to replace the tap, just change the washer.

It is either the washer, hose attach to tap or near the turning knot as in those tap for kitchen sink.

thanks guys, let me have a try.