Watch: EXO's D.O. And Nam Ji Hyun Are Excited And Nervous Behind The Scenes Of "100 Days My Prince" Cameo Reunion

EXO’s D.O. and Nam Ji Hyun, stars of tvN’s “100 Days My Prince,” finally made their cameo appearance in O’live’s “Dear My Room” as a newlywed couple.

With their cameo, D.O. and Nam Ji Hyun reunite with actor Kim Jae Young, who played Moo Yeon in “100 Days My Prince,” as well as PD So Jae Hyun.

For their “Dear My Room” appearance, Nam Ji Hyun consults with Seo Min Seok (Kim Jae Young) regarding the interior for her newlywed home, and when D.O. makes his entrance and asks how it went, she says, in one of several sweet references to “100 Days My Prince,” “He treated me really well, like an older brother.” On their way out, D.O. says to Nam Ji Hyun, “Am I the only one that feels uncomfortable with him? I don’t know, I feel like I’ve seen him somewhere before.”

The drama revealed a behind-the-scenes reel for this scene, in which the actors confess that they feel strange being back together but in present day clothing. Nam Ji Hyun says, “It’s familiar, but I can’t get used to it,” while D.O. comments that suddenly doing scenes with each other without the historical dialect is odd.

Before shooting, D.O. jokes, “Director, I’m nervous.” Nam Ji Hyun adds, “I think I’m going to mess up my lines!”

Come time for the cameras to roll, the actors burst out laughing because of the awkwardness, wondering why they’re suddenly sweating. During a scene between Nam Ji Hyun and Seo Min Seok at the table, D.O. calls Ji Hyun’s name from off-camera, and she says, laughing, “I have one more [line]!”

The camera then cuts to D.O., who gives a sheepish smile to the camera.

Watch the sweet “100 Days My Prince” reunion below!