Classic Sudoku (Fun With Sudoku #179)

Today is Valentine's Day. Wishing all the readers of this blog a happy Valentine's Day with this Valentine's Day special Classic Sudoku. This Sudoku is having two little hearts shape. This is a very old Sudoku created by me. In fact, I wanted to create some Sudoku variation and created this Sudoku and later found out that this Sudoku was solvable even without using Sudoku Variation rules. It can be solved using only Classic Sudoku rules. So I decided to publish it as Classic Sudoku. I leave it to readers to guess out which Sudoku variation I wanted to create using this Sudoku :). Moreover, Classic Sudoku is always part of any Sudoku contest. Be it any Round of Sudoku Mahabharat 2016 or any other Sudoku championship. Classic Sudoku will always be there.
I am posting this Classic Sudoku in the Fun With Sudoku Series as the 179th puzzle in this series. Can you solve this Standard Sudoku puzzle?