There is a half naked guy (topless) always hanging around in the vicinity of Toh Yi Drive HDB residence. His about mid twenties and about 1.75m ht and will appear around after 10pm. He will walk from block to block on the pretext of jogging but always lurking in close proximity to lift lobby, seizing the opportunity to immediately enter the lift after a lady has entered, catching her almost unaware. My daughter experienced twice incident and at first she thought his staying in the same block. Fortunately nothing has happened in this 2 incidents. Just yesterday, he entered our block lift, unknown to him it was my daughter. She gave him a good ear shot of his behaviour. Finally he replied that this one way for him to get to know more gals.