“On call” connected Jazz and contemporary R&B, beautiful EDM vibe and percussion sounds like snap, perfectly matched LuHan's vocal. Lu performed this love song in his own unique style and endeavored many new attempts. The music video approached the story in an overlapping combination of fantasy and reality, making very visually striking scenarios like mails flooded in but not opened, an infinity pool without any drop of water. A strong feeling of emotional gap outflows naturally. In a sense, it’s a “time difference” of people relationship that when life gets busier, individuals are kept from the ones they care about most regardless of actual space & time. Bold images, unlimited imagination, the video story is still in soft and delicate expression just like the song puts it: You know I’m always on call.