In actuality, Alan originally didn't intend to drug Yeon and was only intending to drug Yura.
However, when Alan saw how Yeon was acting toward Yura, seemingly without any care that Yura would take revenge on him afterward…
Alan immediately decided that he was going to drug Yeon too and bring him, along with Yura, to the hotel room that Sharon had booked.
Alan was all too well with how a person would begin to act when they are intending on doing something drastic.
Although Alan was not sure what kind of drastic things Yeon was intending to do, Alan knew it would be best for him to make sure that Yeon wasn't able to do anything to spoil whatever he was intending to do to Yura later on, which was why he decided to drug Yeon too.
Having successfully spiked Yeon's glass with the drug, Alan walked back and sat down on his seat, then picked up his glass of wine and began taking sips of the wine.
