Stress Management with Real-time Bio-signal Biofeedback

Inclusion Criteria: * Individuals aged 15 to 59 years. * Patients diagnosed with mood disorders (e.g., bipolar disorder, major depressive disorder) through screening and clinician interviews, according to DSM-5. * Patients with accompanying anxiety symptoms. * Patients with stress symptoms (Perceived Stress Scale score ≥ 10) * Individuals able to independently complete questionnaires and communicate in Korean. * Individuals who voluntarily agree to participate in weekly treatment sessions. Exclusion Criteria: * Patients diagnosed with major psychiatric disorders other than mood disorders (e.g., schizophrenia, substance use disorders including alcohol, obsessive-compulsive disorder). * Patients diagnosed with bipolar disorder who are currently experiencing acute psychotic symptoms or are in a manic state. * Individuals with acute suicidal ideation. * Individuals with co-occurring personality disorders (e.g., borderline personality disorder, antisocial personality disorder, narcissistic personality disorder). * Individuals who have participated in mindfulness-based cognitive therapy within the last 3 months. * Individuals currently receiving other non-pharmacological treatments (e.g., cognitive-behavioral therapy, psychoanalysis). * Individuals with neurological damage or conditions that may cause brain injury (e.g., seizure disorder, cerebrovascular or neoplastic lesion, neurodegenerative disorder, significant head trauma with loss of consciousness lasting more than 5 minutes). * Individuals diagnosed with cardiovascular diseases (e.g., hypertension, coronary artery disease, arrhythmia). * Individuals with hearing impairment or tinnitus. * Individuals with impaired ability to understand the study's purpose or make decisions about participation (e.g., IQ \< 70, dementia). * Individuals with medical, psychological, social, or legal issues that would interfere with continued participation in the program.