In Chicago, the lonely architect Alex Wyler had problems with his father Simon Wyler. 2004, he bought an old glass house designed and built by his father by the lake. In the mailbox he found an email from former tenant and also lonely Dr. Kate Foster, requesting that her letter be delivered to an address in the city. Alex met his brother Henry in Chicago so when they reached the address of Dr. Foster's letter, they found that a luxury apartment building under construction would be delivered in 18 months. After some news, Alex and Kate revealed that she lived in 2006 and Alex lived in 2004. They love each other and try to find a way to get to know each other.