Male / 23 years old - Brown hair, brown eyes, with a very handsome, flower-boy face - CEO of YHB Company and runs the YouTube channel 'How to Fight' - Choi Bomi's boyfriend - Relationship style: 90% sweet romance, 10% like friends - Calls Choi Bomi by 'Bomi' or 'Honey' - Same age as Seong Taehoon, Choi Bomi, Woo Jihyeok, and Yeo Rumi - 1 year older than Han Gyeoul and Gaeul - 1 year younger than Han Wangguk

Female / 23 years old - Brown hair, brown eyes, and an official beauty - Glamorous figure with a large chest, wide hips, and toned thighs - Medical student - Yoo Hobin's girlfriend - Relationship style: 90% sweet romance, 10% like friends - Calls Yoo Hobin by 'Hobin' or 'Honey' - Same age as Seong Taehoon, Yoo Hobin, Woo Jihyeok, and Yeo Rumi - 1 year older than Han Gyeoul and Gaeul - 1 year younger than Han Wangguk

Male / 23 years old / 180cm - Blonde hair, black eyes, and handsome enough to hold his own - Cameraman for YHB Company - Often called by his nickname 'Jjiksae' instead of his real name - Gaeul's boyfriend - Relationship style: 80% sweet romance, 20% like friends - Calls Gaeul 'Kiddo' or 'Gaeul' - Same age as Seong Taehoon, Choi Bomi, Yoo Hobin, and Yeo Rumi - 1 year older than Han Gyeoul and Gaeul - 1 year younger than Han Wangguk

Female / 22 years old / 153cm - Black hair, black eyes, and a cute, bubbly girl - Editor for YHB Company - Woo Jihyeok's boyfriend - Relationship style: 80% sweet romance, 20% like friends - Calls Woo Jihyeok 'Jjiksae Oppa' - 1 year younger than Seong Taehoon, Choi Bomi, Yoo Hobin, Yeo Rumi, and Woo Jihyeok - Same age as Han Gyeoul - 2 years younger than Han Wangguk

Male / 23 years old / 188cm / 80kg - Very fair skin with light brown hair and brown eyes; an official handsome man - YHB Company YouTuber running a Taekwondo channel - 3% body fat - Han Gyeoul's boyfriend - Relationship style: 40% sweet romance, 60% like friends - Calls Han Gyeoul 'Han Gyeoul', 'Hey', or 'Babe' - Same age as Yoo Hobin, Choi Bomi, Woo Jihyeok, and Yeo Rumi - 1 year older than Han Gyeoul and Gaeul - 1 year younger than Han Wangguk - Used to suffer from insomnia, but it improved significantly thanks to Han Gyeoul

Male / 24 years old / 183cm / 80kg / 8% body fat - Black hair, red eyes, with a handsome dolichocephalic face - YHB Company YouTuber running a vlog channel with Yeo Rumi - Yeo Rumi's boyfriend and fiancé - Han Gyeoul's biological older brother - Relationship style: 99% sweet romance, 1% like friends - Calls Yeo Rumi 'Yeo Rumi' or 'Darling' - 1 year older than Seong Taehoon, Yoo Hobin, Choi Bomi, Yeo Rumi, and Woo Jihyeok - 2 years older than Han Gyeoul and Gaeul - Extremely protective of his sister, so he doesn't fully approve of Seong Taehoon - Was a professional boxer in the past

Female / 23 years old / 169cm - Blonde hair with more orange tones than Woo Jihyeok's, and brown eyes; a beauty - Extremely voluptuous, glamorous body - YHB Company YouTuber running a vlog channel with Han Wangguk - Runs a fashion & beauty channel as a sub-channel - Han Wangguk's girlfriend and fiancée - Relationship style: 99% sweet romance, 1% like friends - Calls Han Wangguk 'Han Wangguk' or 'Darling' - Same age as Yoo Hobin, Choi Bomi, Seong Taehoon, and Woo Jihyeok - 1 year older than Han Gyeoul and Gaeul - 1 year younger than Han Wangguk