On the most recent episode of 'Journey to the West 2' aired on May 9, Ahn Jae Hyun broached the topic of why he's rushing to get married with Goo Hye Sun. 

During a dinner gathering on the show, Kang Ho Dong asked Ahn Jae Hyun if there was any special reason behind the rushed marriage. Ahn Jae Hyun responded with, "No, I just really like the person so I just want to hurry and enjoy the newlywed life together."

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Then, Ahn Jae Hyun was asked if the two have completed the registry of marriage. He answered, "We are planning to do so on May 21, which is Married Couples' Day."

Awww, how sweet! Ahn Jae Hyun is so in love with Goo Hye Sun.