With his first album release since being discharged from the military and a major Hollywood film in the works, Korean mega star Rain is continuing on his path of international fame - and he is not shy about sharing all the juicy details with his fans.

On January 2, K-Pop sensation Rain dropped his sixth full-length studio album Rain Effect under his new record label Cube DC. Originally scheduled to drop on January 6, the release date was pushed up due to the singer's schedule in America where he is filming for the upcoming Bruce Willis action flick, The Prince.

Promotions for the album are set to take Rain through many of the usual channels, one of the first being an interview on Entertainment Relay January 4.

Rain dishes about working with Willis, his relationship with Korean actress Kim Tae Hee, and getting older in an open and honest discussion about his personal and professional lives.

Rain's starring role in the 2009 film Ninja Assassin raised the entertainer's international status, and even after a two year hiatus, his talents have not gone unnoticed, landing him a role in Bruce Willis's latest flick The Prince.

When asked what it was like working with the legendary American actor, Rain said, "He treated me well and hugged me. We had good teamwork and acted well together."

The appearance on Entertainment Relay was Rain's first official post-hiatus interview and in talking about his recent comeback the singer revealed he's not as young as he used to be.

"One thing that has changed since my last comeback four years ago is that I turned 33 [Korean age]," he said. "As I get older, my body doesn't move freely the way it used to. In the past, I was able to perform well even after staying up all night. But now, if I stay up late, I have to rest."

Another thing that has changed for Rain is his very high profile relationship with Kim Tae Hee. The romance was revealed to the public towards the end of his mandatory military service and the couple has (understandably) kept many of the details under wraps.

Rain admitted that he has not received many direct questions about their relationship since he has had few interview opportunities recently.

"She is doing very well," he said of his girlfriend. "We are very busy. It's difficult."

Rain also declined to send a video message to Kim Tae Hee saying, "No, I'll get in big trouble."

Check out the Entertainment Relay interview with Rain below.