30days Album, known as an online photo sharing service, was launched at April 2008. This is a legacy Rails application for two reasons. Firstly, it depends on a very old version of Rails. Secondly, there is not enough of an automated test suite. That is the destiny of historical application.In my presentation, I will introduce various topics including the knowledge of development/operation of legacy Rails applications, the hardship of legacy, the difficulty of adding tests against existing applications, and the attitude of fighting with legacy Rails application.