Tougher was outside my house helplessly. I noticed it couldn't really see me as it was sick. I brought it to vet next day and luckily it survives. It is de wormed and flea free. There are few reasons I can't keep the poor thing:
1) I have to keep it in the cage for whole day when I work as my family doesn't like cat. That's very cruel to a cat to stay in a cage...
2) It is still young and need to be fed regularly.
It is just recovered from sick and so healthy and active now!! For any interested adopter, I will share half of the fee for vaccination and spaying.