This drama definitely exceed my expectation. I thought its your average drama about idols but its more than that.

Setting: There is an AI game called Loveboys. This game has four personality of guys which you could date. You put on the glasses /contacts and your boyfriend shows up. The founder is named Xu Guang han ( played by Ming dao). He created these 4 AI boyfriends aka Y4. This game has been a hit with the ladies in the society. Of course there will be some people who are against it saying the harm that it will cause to society. One person who stands against is the second female lead.

Female lead is a simple but smart gal who accidentally saves a granny. Female lead pays for the granny's medical bill and she is broke. The granny tells the female lead to help her work and she'll pay back the money to the female lead. Turns out the granny is the housekeeper in the big house of the 4 idols. They are actually living human beings! Xu Guang han has been lying to everyone saying they are AI characters. The female lead develops a friendship with the four and later love with the male lead. Eventually her housekeeping identity gets found out. Xu guang han of course doesnt want anyone to know of the 4 idols existence,

I forgot to say the granny is actually the aunt of Xu Guang han. She is the mastermind behind trying to save the four idols. She even creates a secret passage way to get in and out of the big house ( name of the underground house that the four idols are in)
But of course soon or later Xu Guang han catches on! The four tries to expose Xu guang han's true face and he exploited the four idols!

There are two plot twist that are so good! I dont want to spoil it here so go watch for yourself!