Yi Si·乙巳·Eulsa
The Yi Si day pillar — written 乙巳 in hanja, read 을사 (Eulsa) in Korean Saju — is one of the sixty combinations of Heavenly Stem and Earthly Branch that mark a day in the sexagenary cycle. Everything below is read from that pillar’s own structure: its hidden stems, its Ten Gods, and its place in the twelve-stage life cycle.
Personality性
The Day Master is Yi Wood — Yin Wood, the vine or flowering stem rather than the standing tree of Jia Wood: it bends, climbs, and adapts rather than resists. Planted in Si, a Fire branch, it sits directly atop the element it produces (Wood generates Fire), so the pillar's basic structure is continuous outflow — the Day Master is always feeding something outside itself. That reading is confirmed by the twelve-stage position, Bath (沐浴/목욕), the stage of the newborn washed and exposed, associated with allure, sociability, and a self not yet settled into its own shape. Si-sitting Yi Wood tends to be visibly attractive in manner, quick to charm and quick to adapt to whoever is in front of it, but the same placement that gives the charm withholds the ballast; identity is worked out through display and exchange rather than quiet self-possession. The hidden stems sharpen this. The primary qi, Bing Fire (Yang Fire, 16 of 30 days), expresses as 傷官 Hurting Officer — original, sometimes abrasive self-expression, the drive to improve on inherited method — and it dominates the branch outright. Behind it sit two near-equal secondary stems: Geng Metal (7 days), 正官 Direct Officer, respect for rule and legitimate structure, and Wu Earth (7 days), 正財 Direct Wealth, steady earned resource. A branch carrying Hurting Officer and Direct Officer together is in quiet argument with itself: the impulse to break form and the impulse to honor it are both present, and neither fully wins.
Career職
Because Hurting Officer is the branch's primary qi, work suits this pillar when it rewards visible skill or invention over rote compliance — writing, design, teaching, advocacy, entertainment, any field where surpassing the standard method is the value delivered. Direct Officer at middle qi (Geng Metal, 7 days) means the pull toward institutions and formal authority is real, not absent, but sitting behind the stronger Hurting Officer it usually plays out as working adjacent to institutions rather than fully inside their command structure — consulting, litigation, criticism, roles that use official structure as material rather than answer to it directly. The Bath stage adds instability early on: reputation tends to build through visibility and reinvention rather than a single steady climb.
Wealth財
Direct Wealth appears only as residual qi — Wu Earth, 7 of 30 days — present but a trace rather than the branch's substance. More telling is its position in the branch's internal sequence: the dominant stem, Bing Fire, generates the wealth stem, Wu Earth, mirroring the pillar's own root relation of Wood generating Fire. Income is structurally downstream of output — money follows the Hurting Officer's visible work rather than arriving through direct pursuit. This suits earning by producing something recognizably one's own rather than by trading or asset management; the wealth is real but has to be generated afresh through continued expression rather than administered from a fixed base.
Love & Compatibility緣
Yi Wood brings warmth, adaptability, and a genuine gift for putting others at ease, qualities the Bath stage intensifies into real charm and often real romantic restlessness, since Bath describes a self still discovering its shape through contact with others rather than one already settled. The difficulty is the Hurting Officer temperament carried into partnership: low tolerance for being corrected or managed, and a tendency to say the critical thing plainly rather than diplomatically, especially against a partner who leans toward the Direct Officer instinct to structure and supervise. This pillar does best with partners who accept originality without disciplining it, and finds the most friction with those who mistake its need for latitude for a lack of commitment.
Health身
The elemental picture is Wood at the stem sitting on a branch that is overwhelmingly Fire — Bing Fire at 16 days is more than half the branch — with Metal and Earth present only as secondary qi. Continuous Wood-to-Fire outflow is, in five-element terms, a draining relationship for the Wood side; the classical association runs to the liver and tendons on the Wood side and the heart and circulation on the Fire side, and a branch this Fire-heavy in its hidden stems tends toward nervous overextension and a pattern of burning energy faster than it is replenished. The secondary Geng Metal, which controls Wood, reads as a mild constraining pressure worth watching under stress; the residual Earth offers some digestive grounding but not enough to offset the dominant Fire drain.
Best & Worst Pairings合
The strongest matches all share one relation: the branch Si forms a Six Harmony with Shen, transforming to Water, and each of the three best pairings — 壬申 Ren Shen, 庚申 Geng Shen, and 戊申 Wu Shen — pairs that harmony with the early, formative stage of 胎 Fetus. The Water produced by the harmony is exactly what this Fire-heavy branch lacks: it cools the constant Wood-to-Fire outflow and gives the Hurting Officer's output something to be received by. Ren Shen's stem, Ren Water, expresses as 正印 Direct Resource, support without demand; Geng Shen's stem doubles the day branch's own middle qi as 正官 Direct Officer, offering legitimate structure without the same-pillar friction Hurting Officer and Direct Officer create when forced together; Wu Shen's stem mirrors the branch's own residual wealth stem as 正財 Direct Wealth, steady resource matched to steady resource. The worst matches carry the opposite relation: Si clashes outright with Hai, and 辛亥 Xin Hai, 癸亥 Gui Hai, and 己亥 Ji Hai all sit at the exhausted 死 Death stage on top of it. The clash scatters the Si branch's stored qi rather than harmonizing it; Xin Hai's 七殺 Seven Killings compounds the disruption with unmediated pressure, while Gui Hai's 偏印 Indirect Resource and Ji Hai's 偏財 Indirect Wealth turn support and income into something arriving unpredictably rather than reliably.