Lucas is a blogger from Germany who loves "city rambling" — not rushing between sights, just walking and looking.

He rambles in Shanghai: the Bund at dawn, alleyways at noon, little shops in the plane-tree district. In Hangzhou: West Lake in the rain, the canal at dusk, teahouses in old streets.

His videos are quiet and healing, like love letters to cities. He records sounds and details: a shoe repairer, a flower shop owner, seniors doing morning exercises.

The best way to understand a city is walking, he believes. From Berlin to Shanghai and Hangzhou, he met the soul of cities at a slow pace.

Lucas is a German city wanderer whose life shuttles between Shanghai and Hangzhou. By day he attends meetings in Shanghai office towers; on weekends he drinks tea in Hangzhou teahouses.

His dual-city life: "Shanghai gives me opportunity; Hangzhou gives me life" - he loves the Bund and metro, and also West Lake and osmanthus scent. Two cities, two rhythms, both loved.

Content: "a German Shanghai-Hangzhou dual-city diary", "Shanghai fast pace vs Hangzhou slow life", "running in Hangzhou hills" - his daily dual-city record.

Going viral: his "why I love Shanghai and Hangzhou at once" video spread - ten reasons: Shanghai efficiency, Hangzhou scenery, food in both, and friendly people in both.

Observations: "Chinese cities are not one style like Europe; each has its own soul" - he is making a "Chinese city character" series, getting to know them on foot.

Significance: he represents foreign views of Chinese cities - his dual-city life shows their diversity and complementarity.

Plans: he will run ten routes across Shanghai and Hangzhou and write a city essay book, Dual-City Life.

For readers: his videos help you understand Chinese dual-city life - and see two charms of Chinese cities; fast and slow are both enchanting.

He summarises his dual-city strategy: weekday mornings coffee at Shanghai People Square, weekend mornings running by West Lake; weekday business lunches, weekend a bowl of pian er chuan noodles. "Two cities are like two sides of a person - one for dreams, one for life." He notes high-speed rail makes them "as close as neighbours" - ordinary in China, unimaginable in Europe. He is writing an essay on Chinese urbanisation for a European urban-studies journal.

He plans to turn "dual-city life" into "lifetime life" - considering a small Shanghai apartment to put down roots. "I used to think I was a passer-by; now I want to be part of here." He is learning Benbang cooking, planning a "Shanghai-Hangzhou fusion" dinner for Hangzhou friends. "Two cities taught me life can have two rhythms, and both are good." His story is a European finding life answers in China.