Provided is a novel JAK-specific inhibitor compound and a method for preparing the same. The compound of the provided can exhibit therapeutic effects on a variety of diseases, for example, inflammatory diseases, autoimmune diseases, myeloproliferative diseases, and human cancers due to its ability to regulate signal transduction at the level of JAK kinases. In particular, due to its high selectivity for JAK1, the compound of the provided can exhibit better therapeutic effects on inflammatory diseases and autoimmune diseases at a low dose and with fewer side effects and can be expected to be effective in preventing and treating liver fibrosis.