Who is the impostor?

Good chapter , i like the leads and that Baek Ho Rang is a strong girl and wouldn't let anybody bring her down, and male lead Go Eun Tak gives me vibes of the male lead of My ID is a Gangnam beauty, looking forward to see how they'll fall in love with each other. Everything makes Ji So Hyun look like the impostor, but she knew Ho Rang from the past somehow, lets see how it unfolds...