About MoonSun
Moon Byul-yi (Moonbyul) and Kim Yong-sun (Solar) are members of MAMAMOO, the acclaimed four-member girl group that debuted under RBW Entertainment in 2014. Solar is MAMAMOO's leader and main vocalist; Moonbyul is the group's main rapper and only member who regularly presents in a more androgynous, swaggering stage style — a contrast that fans have always loved placing beside Solar's theatrical warmth. MoonSun is one of the most beloved same-group ships in the K-pop girl-group space. Moonbyul has publicly called meeting Solar one of the best things to happen to her, and the two have referred to each other in terms that fans describe as soulmate-level closeness. Their dynamic — Moonbyul's cool, teasing energy against Solar's loud, expressive personality — creates the kind of bickering-best-friend chemistry that fan communities thrive on. Beyond ship content, Moonbyul and Solar are genuine artistic collaborators. Both have appeared in each other's solo content and the group's variety work, and their long career together as MAMAMOO's most-shipped pairing has given fans an enormous library of documented interactions spanning live stages, reality shows, and candid backstage footage.
MoonSun is widely considered the flagship MAMAMOO ship, with a dedicated fandom that has stayed active across the group's entire career and into their solo eras. The ship is celebrated for Moonbyul and Solar's genuinely warm, demonstrative friendship — fans describe their bond as a rare example where the public record of closeness matches the fan narrative.
Fun facts
- ✦ Moonbyul has said that meeting Solar was one of the best things to happen to her — a quote widely cited in MoonSun fan spaces.
- ✦ Fans frequently describe their bond as soulmate-level closeness, citing years of variety appearances and candid interviews where both have spoken warmly about each other.
- ✦ Their Battle Trip episode, where they traveled together, is frequently referenced as a fan favourite for the 'married couple' dynamic it showcased.
- ✦ Moonbyul is MAMAMOO's sole rapper; Solar is the leader and main vocalist — making them one of the most complementary pairings in the group.
- ✦ MoonSun has one of the longest-running dedicated ship threads in the MAMAMOO fandom, active from the group's debut through their current solo eras.
Moments
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2022-08
MAMAMOO+ subunit debut
Moonbyul and Solar launched their official subunit MAMAMOO+ with the debut single 'Better', marking the first time their partnership was formally recognized as a duo unit within the group — a milestone fans celebrated as institutional acknowledgment of the MoonSun bond.
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2017-12
Battle Trip episode
Solar and Moonbyul appeared together on the KBS2 variety travel show Battle Trip (episode 74, aired December 2, 2017), taking a trip to Hong Kong as a pair. Viewers noted the easy, lived-in comfort of their interactions, with fan sites quickly tagging the episode as one of the definitive MoonSun moments.
Ship Couples ranking by year
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2020
#19
93725 votes
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2021
#74
258 votes
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2022
#52
1502 votes
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2023
#68
169 votes
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2024
#48
555 votes
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2025
#53
102 votes
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2026
#40
138 votes
Best finish: #19
The pairing
Fan gallery
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