This song “Please Be Careful with My Heart” was originally released in 2012 by Filipinos Jose Mari Chan (Composer and singer) singing together with another Filipino Regine Velasquez. If you are in western countries, you might not know this song although I personally have heard it played in the Radio Stations. But this song is very popular in South East Asia. It is one of a South East Asian evergreen song that has stood the test of time, as it is often played in weddings and has been covered by many South East Asian artists and singers.
The most beautiful version, in my opinion is the one performed by duet of multi-talented Indonesian and Filipinos Singers/artists Bunga Citra Lestari (aka BCL) and Christian Bautista which was released in 2014 as part of a movie sound track.
This is the BCL and Christian Bautista version.
The vocals of BCL and Christian are smooth, expressive, and blend well together. The song's arrangement is also more subdued, with a gentle piano accompaniment played by Christian himself.
What is also impressive here in my opinion especially BCL both could convey this song with a good English articulation with greater clarity and fluency, that help them to connect with a wider audience, considering both have never lived or educated in English speaking countries. AFAIK not many Indonesian singers with similar background could reach this level.
The original version from Jose Mari Chan and Regine Velasquez is also beautiful.