Then I went back to the harbor and go north to the lighthouse. It's located on the top of a hill which might take me 20 minutes and it closed at 5 o'clock which is so early. I planed to wait for the sunset here but obviously, I can't.
After doing down to the start, at the sign to go lighthouse or Cihou Fort (or Cihou Battery). Go on the way to Cihou Fort but don't go up, there is a trail to going down to the beach and then go through a weird tunnel, you may find a place where I took above photos.