We've seen the 'Second Time Twenty Years Old' individual teasers for the dad and ex-boyfriend. Now it's time to see the reactions of the son and son's girlfriend!

In A Pink�Na-Eun's hilarious teaser above, she complains to her friends, "Oh, so annoying! Why is my boyfriend's mom joining us in the entering year of '15?"

That's when she spots Choi Ji Woo happily waving to her, and Na-Eun turns a 180 and tells her friends, "Since she's coming, let's treat her well! She's my mother-in-law. How nice is that? Right?"

Kim Min Jae starts off pretty content in his teaser as he looks at his paper, saying, "As of today, I'm a new student for the entering year of '15. But... my mom is in the same year as me." He then flails around in frustration.

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The hilarious drama is set to air on tvN on August 28!

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