Regular by A2-Type
http://www.a2-type.co.uk/html/regular_light.html
http://vllg.com/A2-Type/Regular

Hi Akira. Think you meant to post this in response to robotrock's other ID request.
BTW I can't name "curiosity" offhand, but it looks awfully familiar.
Don

Don, thanks a lot! I was going to post on the other thread, but posted on the wrong one.

And I believe the serif face was designed by A2-Type, too.
http://www.a2-type.co.uk/html/commission.html

You're welcome Akira.
And "curiosity" is indeed answered.
The A2-Type website provides an interesting mix of well designed retail fonts & commission work. This seems to be a good way for studio size font makers to operate.
Don