Inclusion criteria:  For patients in the SMART trial and qualitative interviews  Being 18 years and above; Being diagnosed with psychotic symptoms or MDD; Having received in-patient care for three days or more; Living in Shenzhen and having no plan to leave Shenzhen in the following 12 months after discharge; Being able to read text messages, answer phone calls on mobile phones, use WeChat or any application on smart phones.  For lay health care supporters (LHSs) in qualitative interviews  Being 18 years and above; Being without any diagnosis of mental disorder; Being the lay health care supporter in the family; Living in Shenzhen and having no plan to leave Shenzhen in the following 12 months after discharge; Being able to read text messages, answer phone calls on mobile phones, use WeChat or any application on smart phones.  For the clinic and community mental health service providers in qualitative interviews  Being 18 years and above; Having practiced in mental health service at least for 12 months.  Exclusion criteria for patients in the SMART trial and qualitative interviews  Unable to provide written consent due to any cognitive problems. Being discharged by the patient's or LHSs' demand against medical advice. With no ID, no stable residence nor any source of income.