The ambient-condition acetylene hydrogenation to ethylene (AC-AHE) process is a promising non-oil route for ethylene production with lower energy input compared to conventional methods. Pd-based catalysts, although efficient, face challenges such as low conversion and over-hydrogenation at elevated temperatures, leading to high energy consumption and by-product formation. Various tactics have been explored to enhance catalyst performance, but trade-offs between activity, selectivity, and stability persist. A new study introduces a highly efficient AC-AHE process using S-confined atomic Pd species on tungsten sulfide, achieving over 99% acetylene conversion, 70% ethylene selectivity at room temperature, and a record space-time yield of ethylene. This catalyst exhibits excellent stability over 500 hours, attributed to unique Pd-S coordination that promotes acetylene hydrogenation while preventing over-hydrogenation. Experimental and theoretical analyses confirm the catalyst's superior performance, offering a promising alternative for ethylene production with high productivity and stability. The study's findings represent a significant advancement in catalytic processes for ethylene production, showcasing improved selectivity and productivity at ambient conditions.