'He is Psychometric' week 5 reveals why Seung-mo is desperate for Lee Ahn to read him

Last week, we saw 'He is Psychometric' end on a rather disturbing note. Seung-mo realized that the murderer who is behind two fire accidents is after Yoon Jae-in, the girl that Seung-mo sponsored for three years and who is now a detective. She is also training Seung-mo's brother Lee Ahn to get better at Psychometry and is romantically involved with him too. If you recall, Seung-mo had told Jae-in that he wants his brother to get good enough to read him. Lee Ahn has not been able to read Seung-mo for the longest time and the reason had never been explored until the last episode. We saw Seung-mo come to terms with his connection to the murderer. Seung-mo's mother, who is assumed to have died in the fire was abused by a man and this could be the murderer.