In 'Good Day,' Kim Goeun and Jung Haein appeared, setting the stage ablaze with G-Dragon. Particularly, the controversial Kim Soo-hyun made a brief appearance, perfectly filled in by Kim Goeun.

On the broadcast of MBC's 'Good Day' on the 16th, Jung Haein also made a surprise appearance following Kim Goeun.

On that day, a new chemistry among Kim Goeun and friends from Hannam-dong was showcased for G-Dragon's music project. The music studio of producer G-Dragon was also revealed for the first time on air. G-Dragon, deeply immersed in his work, welcomed Cho Sae-ho and Code Kunst, who arrived after sensing some movement.

Continuing, Cho Sae-ho noted, "I was going to introduce a good friend from Yongsan who is the same age," and it was at this moment that Kim Goeun made a surprise appearance as a neighborhood friend living in Hannam-dong, showcasing new chemistry with G-Dragon, Cho Sae-ho, and Code Kunst. Cho Sae-ho remarked, "There’s an important note: Kim Goeun sings really well," referring to her singing skills. Kim Goeun, known for her clear and resonant voice, revealed that she uses karaoke as a way to relieve stress, sharing her unique karaoke philosophy, which drew laughter.

Thus, the friends from Hannam-dong reunited at Kim Goeun's favorite karaoke spot. Especially when mentioning Jung Haein, who co-starred with Kim Goeun in the film 'Yoo Yeol's Music Album,' Kim Goeun said, "We're close too." Immediately, G-Dragon called Jung Haein. Jung Haein expressed joy, saying, "Ah, you're with Goeun." Kim Goeun asked, "We’re at the karaoke, if you’re done with your schedule, would you come by?" Jung Haein responded, "Shall I go?" and Kim Goeun replied, "I hope you come; how long do you think it will take to get here?" To this, Code Kunst remarked, "I’m glad because you’re close with Goeun; you’re closer than us," and Jung Haein said, "I’ll go quickly."

He then joined the karaoke members, bringing joy. When Code Kunst remarked, "Haein's here, so your expression is bright," Kim Goeun laughed, saying, "No, I was comfortable earlier too." When Cho Sae-ho explained the karaoke meeting that was planned quarterly in Hannam-dong, Jung Haein expressed his willingness to join, saying, "Count me in. If you call me, I’ll run over." Kim Goeun humorously said, "Then you owe me 50,000 won," and Jung Haein coolly agreed, while Cho Sae-ho stated, "The leader here is Kim Goeun."

First, Jung Haein chose 'With a Heart That Should Forget' by Kim Kwang-seok, followed by G-Dragon's selection. G-Dragon selected 'Baby Baby' by 4Men, and Kim Goeun and Jung Haein in the front row remarked, "We succeeded; the song feels different," expressing admiration. Next was Kim Goeun's turn. With Kim Goeun's sweet vocals on 'A Breathe' by Lee Hi, everyone was captivated. The friends from Hannam-dong also shouted, "We love you, Kim Goeun," and called her "Chameleon Kim Goeun." Kim Goeun remarked, "I feel like my heart is going to burst; I can’t do it," showing nervousness. G-Dragon commented, "I’ll take you on 'Good Day,'" and Code Kunst added, "We would have probably given you the acceptance necklace right away."

Next, Jung Haein selected 'Our Blues' by Lim Young-woong, perfectly hitting high notes. The highly anticipated final stage belonged to Kim Goeun’s request song, 'Dare.' When G-Dragon, the owner of the song, sang 'Dare,' Kim Goeun and Jung Haein exclaimed, "Wow, this is amazing," and "We need to record this," capturing the memorable scene of filming G-Dragon's direct camera video with their phones.

Notably, a karaoke concert featuring G-Dragon, which couldn't be seen anywhere else, unfolded, with G-Dragon even achieving a perfect score of 100. Kim Goeun expressed her thoughts, saying, "It was exhilarating; I jumped around a lot and had fun," while G-Dragon stated, "It was so enjoyable; I have energy and a good tone, and I proved that everyone here can sing," as he formed a small group with a contribution of 50,000 won.

Meanwhile, on that day's broadcast, Kim Soo-hyun, who has been at the center of controversy due to the issue involving the late Kim Sae-ron, made a brief appearance that caught attention.

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