Why did Nichkhun tear up in front of Victoria?

Why did 2PM's Nichkhun show tears in front of his wife,�f(x)'s Victoria? The upcoming episode of MBC's "We Got Married - Season 3", shows the second part of Nichkhun's and Victoria's mission as "one-day journalists", assigned to�introduce the taste of Korea for a "worldwide tourism brochure". After covering a restaurant that specializes in samgyetang (Ginseng Chicken Soup), Nichkhun and Victoria went to the bossam (cabbage wraps with pork) shop that Nichkhun went to when he first came to Korea. With the help of 2PM's Chansung, Nichkhun was able to cover the story as well as any professional journalist. However, while he was covering the story with Victoria, an unexpected incident took place. Nichkhun, who was conducting an in-depth coverage of the restaurant, had a sudden rush of emotion, and even showed some tears. Surprised at seeing Nichkhun's sudden emotion, Victoria became silent. After the recording, she revealed her true feelings about her husband's tears. For more details, be sure to tune into "We Got Married" on April 16th (or check back with allkpop for updates!). Source: TV Daily via Nate