O London Bus, thou art translated ...

Today, for the first time, I saw a London bus advertisement (apparently for drinking milk, or something) written entirely in a language I cannot read at all, let alone translate.

Don't misunderstand me - advertisements in languages other than English without a translation are very common in London and not at all remarkable, but they're usually small in scale, the largest being shop names saying obvious things like "POLISH FOODS" in Polish. As far as I remember, this is the first time I've seen a foreign-language ad on a bus.

O London Bus, thou art translated! Click to embiggen.

Although the shapes of the characters are of course vaguely familiar, the only one that means anything specific to me is the fifth one which I know as "rèn", a human being. Now, there are numerous languages written in Chinese characters, and I have no reliable way of knowing even which one this is, although under the circumstances Modern Standard Mandarin seems the most likely candidate, with Cantonese perhaps second favourite.

I am curious to know if the man in running shirt and glasses is 'just a man,' or someone the target audience would recognise.

I can't use Google Translate for this because I don't know how to write the characters on my computer. Can any of my readers (a) confirm the language, (b) make a pinyin transcription (c) translate the text? [Edit: Answers here]

The location, incidentally, is the corner of New Oxford Street, where the umbrella shop is.