TB-840(Agonist of RORα) is a candidate for NASH treatment that activates RORα(Retinoid-related orphan receptor) and its target validation for RORα and potential as a NASH treatment. This study is a dose block-randomized, double-blind, placebo-controlled, single- and multiple-ascending dose study. For each dose group, 6 subjects will be randomly assigned to the test group (TB-840) and 2 subjects will be randomly assigned to the control group (placebo). Adverse event (AE) monitoring, physical examination, vital signs, ECG, clinical laboratory test will be done for safety and tolerability assessment, and blood and urine samples will be collected for Pharmacokinetic (PK) assessment.