Well, it looks like Love Letter From Thief X will be following the shoes of In Your Arms Tonight, My Forged Wedding, and Be My Princess as Voltage Inc. is finally going to update Love Letter From Thief X to the new UI!
Fans have been waiting for it for some time now, and some have even worried that it would fall in the same status of Pirates in Love and Seduced in the Sleepless City, two games that still use the old UI and whose update statuses have pretty much been dropped.
Though Voltage Inc. is currently in the process of preparing everything for the update, there has yet to be any indication of a release date. Keep an eye out on their Facebook page for any announcements! Who knows? We might be hearing something from them soon enough!