Jasper Yu says to YSITD
Jasper, We detected a login into your account from a new device on 05/07/2017 at 01:26:34 UTC. Device: Web Location: TW, 03 (IP = 223.200.159.20) If this wasn't you, you can go to Settings - Privacy and Security - Sessions and terminate that session. If you think that somebody logged in to your account against your will, you can enable two-step verification in Privacy and Security settings. Sincerely, The Telegram Team