Saesang incidents:

1. When Infinite used to live in their old dorm ( the very small one from “sasame player”(?) ) after “Be Mine” got popular, a saesang entered when they were sleeping and took some clothings of theirs.

2. When they moved to the dorm featured in “A Birth of a Family” (?), a saesang fan pretended to be a resident in the apartment and entered the elevator together with Myungsoo/L. Myungsoo had a instinct feeling that this girl was a saesang, so when the floor for Myungsoo arrived, he gave her his usual fierce stare and cocked his head a bit. When she saw that, I guess she felt a bit scared and ended up not following him. But as he was going into the house, she yelled “The fans should know of this kind of behavior toward your fans!” and ran off.

3. Now, Infinite moved to a new apartment, and recently, some saesangs again took their clothing and took pictures while they were sleeping. Also, it is reported that they do this when Infinite leaves the house vacant. After that happening in their new house, no matter how best they tried to keep the saesangs away, Myungsoo and Sunggyu cried.

4. When they went to Japan, some saesang fans in Japan entered the hotel room and stole some articles of clothing/items. They are in Japan. They are tired. They should be able to sleep peacefully and get some rest without all this stress.

5. Infinite had to apologize multiple times to the neighbors near their dorm because the saesang fans were being very loud. That is the main reason why they have to keep moving; the saesang fans leave trash and other things in front of the dorm, so neighbors end up filing complaints.

6. A saesang fan came too Woohyun’s brother, Boohyun’s restaurant and was being roudy, loud, disrespectful. Boohyun couldn’t possibly yell at the girl, because it would disturb other costumers, so he ended up posting an apology on the online site of his restaurant. 

7. All during the day, saesangs are always outside, trying to take a picture of something they are doing. Saesangs usually stay hidden, that is why normal fans cannot spot them all the time. Most of them secretly take a picture of them sleeping.

source where information came from: http://kuroidaiyamondo.tumblr.com/post/42856541437/infinite-saesang-fans