Symbolism
The Korean dragon (용, yong — also 룡 ryong; in native Korean 미르, mireu) is, across Korean tradition, a primarily benevolent being tied to water and agriculture: a bringer of rain and clouds, said to reside in rivers, lakes, deep seas, and mountain ponds. This is its central register — protective and life-giving rather than fearsome. It is often depicted holding or pursuing the yeouiju (여의주), the wish-fulfilling orb (the East Asian cintamani), and was historically associated with kingship and the moral authority of rulers. The Korean dragon shares the East Asian dragon lineage (Wikidata Q2386666); within that lineage Korean tradition prizes the four-toed, long-bearded form as the wise and powerful one.
A Korean dragon tattoo is not a different creature from its Chinese or Japanese relatives — visually the East Asian dragon is shared — but the reading and the rendering differ. The Japanese irezumi 龍 belongs to a specific tattoo idiom with its own conventions; the Korean dragon carries the register of the benevolent water guardian, and Onsil renders it in the minhwa and East-Asian-ink lineage: repeated scales, the tonal depth of ink-like shading (먹색의 농담), and movement carried through the body rather than around a fixed symbol. Onsil frames the dragon honestly — a shared motif, read and drawn in the Korean traditional manner — rather than claiming it as Korea-only.
The dragon sits outside the eight-motif minhwa folk-painting glossary (kkachi-horangi, morando, irwolobongdo, sipjangsaengdo, hwajodo, eohaedo, munjado, chaekgado) — those are household-scale art forms. The dragon belongs to the Korean guardian-creature tradition alongside the haetae (해태) and other guardians. As a tattoo it suits the arm and sleeve unusually well: the long serpentine body wraps the muscle lines naturally, the head and upper body hold presence near the shoulder, and scales, red energy, and a lower vortex carry the motion down toward the wrist — the composition moves with the structure of the body rather than sitting still on it.