The article examines "Workplace Telepressure"—a psychological condition where always-on work communication (LINE, Slack, Teams) blurs work-life boundaries and creates compulsive response behavior. Research on 234 employees over 3 months shows high telepressure correlates with accumulated cognitive fatigue and sleep quality degradation, as the brain remains in constant alert mode. The root cause is organizational culture and hidden expectations, not explicit policy—leading employees to feel obligated to respond immediately even off-hours. Early engagement feelings eventually flip into burnout if rest is inadequate.