"Angel Eyes" Koo Hae Sun found the letters that Lee Sang Yoon had written to him in the past.
On the episode of SBS weekend drama "Angel Eyes" broadcast on May 11th, Dong Joo (played by Lee Sang Yoon) and Soo Wan (played by Koo Hae Sun) made dinner together and ate together, spending a great time.
On this day, while Dong Joo was washing the dishes, Soo Wan secretly went into Dong Joo's room and opened up the drawers of Dong Joo's desk and left a gift there. Soo Wan found a batch of letters there. These were letterse that Dong Joo had sent from the U.S. to Soo Wan.
Dong Joo saw this and said, "This isn't fair. You didn't write anything" and didn't allow him to look at the letters. However, Soo Wan answered, "I didn't know the address."
At this, Dong Joo asked, "You didn't receive the letter with the addresses?" Soo Wan said, "Letter? The address? When and where?" and recognized the fact that he didn't receive a letter.
Dong Joo heard this and said, "Before in the hospital" and was deep in thought thiking, "I guess you threw it out while cleaning." Soo Wan was in awe saying, "But it's weird that it was sent back too."
Dong Joo said, "If you want to see this letter, then let's exchange and barter goods" and asked Soo Wan to write a letter.