Development of patient-centered message bank: The DKU research team will work with the PHRI research team to develop the message bank through literature review search. The message bank will cover five domains to help MI patients with medical adherence and lifestyle modification: 1) medical adherence; 2) diet; 3) exercise; 4) smoking cessation; 5) general heart health (see appendix 4 for the messages). To contextualize the messages and ensure its comprehensibility to patients, the Fudan and Hainan research team will invite physicians to validate the message (see appendix 5 for the message validation survey). Physicians will be asked to score each message in terms of its likability and comprehensibility. Two messages in each domain with the lowest score will be deleted. Considering that reading texts might be difficult for some patients, voice message option is also available for patients to choose. The contents of both the texts and voice messages are identical.