There is no leak from the car.
It is just shifting gear is a bit rough, and sometimes makes noise as well especially on reverse gear.
Clutch pedal itself is feeling not too abnormal. It goes down to floor and comes back up as normal.
But clutch point is very high up, and engine revs up on 2nd and 3rd gear, but car doesn't drive faster.
So we will be looking at replacing the clutch kit, and it is high possibility.
Hopefully replacement work will clear all the problems.